Pregnancy often comes with unexpected findings on an ultrasound scan. One of the terms that can immediately make a woman anxious is placenta previa. You may hear that your placenta is “low lying” during the routine pregnancy scan and immediately wonder: Will my baby be safe? Can I have a normal delivery? Did I do something wrong?

The reassuring part is that finding a low-lying placenta during the middle of pregnancy does not always mean that you will have placenta previa at the time of delivery. As the uterus grows, the relationship between the placenta and the cervix often changes, and a placenta that appears low earlier in pregnancy may no longer be close to the cervix later on.

Understanding what placenta previa actually means, why it happens, how it is monitored and when it becomes a concern can make the diagnosis much less frightening.

What Is Placenta Previa?

The placenta is a temporary organ that develops during pregnancy. It connects the mother and baby through the umbilical cord and supplies the baby with oxygen and nutrients while also helping remove waste products.

Normally, the placenta attaches higher up inside the uterus. In placenta previa, the placenta is positioned in the lower part of the uterus and may reach or cover the opening of the cervix.

The cervix is the lower opening of the uterus that eventually needs to open during vaginal birth. If the placenta completely covers this opening near the end of pregnancy, it can obstruct the baby’s passage and create a significant risk of bleeding when the cervix begins to change or open. Current clinical definitions distinguish placenta previa, where the placenta covers the internal cervical opening, from a low-lying placenta, where the placental edge is close to but does not cover the cervix.

This distinction is important because a placenta described as “low lying” during an earlier scan may not remain low by the later stages of pregnancy.

Low-Lying Placenta and Placenta Previa: Are They the Same?

These two terms are often used interchangeably in everyday conversations, but medically they describe slightly different situations.

A low-lying placenta generally means that the placental edge is close to the cervix. Current guidance commonly uses a distance of less than 20 mm from the internal cervical opening to describe a low-lying placenta after the mid-pregnancy stage. Placenta previa refers to the placenta lying over the internal cervical opening.

So, if your ultrasound report says “low-lying placenta,” it does not automatically mean that you have persistent placenta previa.

Your obstetrician will consider the gestational age, the exact placental position and the distance from the cervix before deciding what follow-up is required.

Why Does Placenta Previa Happen?

In many women, there is no single identifiable reason why the placenta implants in the lower part of the uterus. It is not something you caused by walking, climbing stairs, eating a particular food or performing routine household activities.

However, certain factors can increase the likelihood of placenta previa.

A previous caesarean birth is an important risk factor, and the risk increases with additional caesarean deliveries. Previous surgery involving the uterus, fertility treatment such as IVF, multiple pregnancy, increasing maternal age and some previous uterine procedures have also been associated with a higher likelihood of placenta previa.

This is particularly relevant for Indian women because caesarean delivery is relatively common, and many women may be planning a second or third pregnancy after a previous caesarean. A previous caesarean does not mean that placenta previa will definitely occur, but it is one reason doctors pay careful attention to placental location during pregnancy scans.

What Are the Symptoms of Placenta Previa?

One of the characteristic symptoms of placenta previa is vaginal bleeding during the second half of pregnancy.

The bleeding is often described as painless and may occur suddenly. It can be light spotting or, in some cases, heavy bleeding. However, not every woman with placenta previa experiences bleeding before delivery. Some women are diagnosed during a routine ultrasound even though they have never had symptoms.

This is why vaginal bleeding during pregnancy should never be dismissed as “normal,” even if you feel completely well.

If you are pregnant and experience vaginal bleeding, particularly after the middle of pregnancy, contact your obstetrician or maternity hospital promptly. The cause cannot be determined safely at home.

How Is Placenta Previa Diagnosed?

The position of the placenta is routinely assessed during the detailed mid-pregnancy ultrasound, commonly performed around 18 to 21 weeks.

If the placenta appears close to the cervix, your doctor may recommend another scan later in pregnancy. This is because the uterus changes significantly as pregnancy progresses, and a placenta that appeared low at the earlier scan may become positioned farther away from the cervix as the lower part of the uterus develops.

A transvaginal ultrasound may be recommended when the exact relationship between the placenta and cervix needs to be assessed. Despite what the name may sound like, this is considered a safe and accurate method for evaluating placental location when clinically indicated.

Your doctor may schedule additional ultrasound examinations depending on the findings and your individual pregnancy.

Can a Low-Lying Placenta Move Up?

This is one of the most reassuring things for many pregnant women to understand.

The placenta does not usually “move” through the uterus like an object changing position. Instead, as the uterus grows and the lower uterine segment develops, the placenta may become farther away from the cervix in relation to the changing uterus.

This is why many women who have a low-lying placenta identified during the mid-pregnancy scan no longer have the problem later in pregnancy.

However, this cannot be predicted with certainty in an individual woman. Follow-up ultrasound is therefore important.

Does Placenta Previa Mean I Cannot Have a Normal Delivery?

Not necessarily.

The mode of delivery depends on the final position of the placenta, the distance between the placental edge and cervix, whether the placenta covers the cervix, whether bleeding has occurred and other pregnancy-related factors.

If placenta previa persists and the placenta covers the cervical opening, a caesarean birth is generally recommended because attempting vaginal delivery could cause serious bleeding. When the placenta is low lying but does not cover the cervix, the situation can be different, and the obstetrician will assess whether vaginal birth is appropriate based on the individual circumstances.

Therefore, an early ultrasound finding should not automatically be interpreted as a final decision about your delivery.

What Happens If Placenta Previa Causes Bleeding?

Bleeding associated with placenta previa can sometimes become significant. The immediate priority is always the safety and stability of the mother and baby.

Your medical team may assess your blood pressure, pulse, haemoglobin and the baby’s condition. Depending on the amount of bleeding, gestational age and clinical situation, hospital observation or admission may be necessary. If there is a significant risk of premature birth, doctors may consider antenatal corticosteroids to support fetal lung maturation when appropriate.

The exact management varies from woman to woman. A woman with no bleeding and a stable pregnancy may be managed very differently from someone experiencing repeated or heavy bleeding.

Placenta Previa and Placenta Accreta: Why Previous Caesarean Matters

There is another condition that doctors may consider when placenta previa occurs in a woman who has had previous uterine surgery: placenta accreta spectrum.

In placenta accreta spectrum, the placenta attaches abnormally deeply into the uterine wall and may be difficult to separate after birth. The likelihood is higher when placenta previa occurs alongside previous caesarean delivery, particularly as the number of previous caesareans increases.

This does not mean that every woman with placenta previa and a previous caesarean has placenta accreta. It simply means that doctors may look more carefully at the placenta during ultrasound and plan delivery accordingly if there are concerning features.

What Should You Do If You Have Been Told Your Placenta Is Low?

First, do not panic.

A low placenta found during the mid-pregnancy scan often requires monitoring rather than immediate treatment. Attend the follow-up ultrasound recommended by your obstetrician and keep your pregnancy appointments.

If you experience vaginal bleeding, contractions, abdominal pain or any other concerning symptoms, contact your maternity-care team immediately. Do not wait for your next scheduled appointment.

It is also important not to make decisions about sexual activity, exercise, travel or work restrictions based solely on information found online. These recommendations depend on whether you have placenta previa, whether you have experienced bleeding and your overall pregnancy history. Your own obstetrician can give you advice appropriate to your situation.

Can Placenta Previa Be Prevented?

There is no guaranteed way to prevent placenta previa.

Some recognised risk factors cannot be changed, including age and previous pregnancy or uterine surgery. Smoking is also associated with increased risk, so avoiding tobacco and nicotine exposure is an important part of healthy pregnancy care.

Most importantly, a woman should not blame herself if placenta previa is diagnosed. It is related to where the placenta implants, and in many cases there is no obvious reason that could have been prevented.

When Should You Seek Urgent Medical Attention?

For a pregnant woman with a known low-lying placenta or placenta previa, any vaginal bleeding should be taken seriously.

Seek urgent medical assessment if you notice fresh vaginal bleeding, particularly if it is heavy or recurrent, or if bleeding is accompanied by contractions, pain, dizziness, weakness or reduced fetal movements.

Do not try to determine at home whether the bleeding is “only spotting.” Pregnancy bleeding after the first half of pregnancy has several possible causes, and professional assessment is important.

Placenta Previa Explained Simply: The Key Message for Mothers

Being told that you have a low-lying placenta can sound frightening, especially when you are already thinking about your baby’s health and delivery. But the diagnosis is not always as alarming as it first appears.

The placenta may be low during the middle of pregnancy and later become sufficiently far from the cervix. For women whose placenta remains over the cervical opening, closer monitoring and a carefully planned delivery can significantly improve safety.

The most important steps are simple: understand your ultrasound report, attend recommended follow-up scans, tell your obstetrician about any bleeding and never ignore a significant change in your pregnancy symptoms.

For Indian women balancing pregnancy with family responsibilities, work and everyday life, clear medical information can make a complicated diagnosis easier to understand. Placenta previa is a condition that requires attention, but it is also a condition that can be monitored and managed with appropriate obstetric care.

Pregnancy Care with Dr. Shweta Bansal Wazir

Dr. Shweta Bansal Wazir provides obstetric and gynaecological care with an emphasis on clear communication, individualised pregnancy management and helping women understand what is happening throughout their pregnancy. Women concerned about a low-lying placenta, vaginal bleeding, previous caesarean delivery or other pregnancy-related concerns can seek professional assessment rather than relying on online information alone.

For appointments and consultations, contact +91 84481 28007 or visit drshwetawazir.com.