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Placenta Previa in Pregnancy: Symptoms, Risks and How Delivery Is Planned
Finding out that your placenta is lying low during pregnancy can naturally cause concern. You may immediately wonder: Is my baby safe? Will the placenta move? Can I have a normal delivery? What happens if I start bleeding?
The good news is that a low-lying placenta found during the middle of pregnancy often does not remain low by the time the pregnancy reaches term. However, when the placenta continues to lie very close to or over the cervix later in pregnancy, it requires careful monitoring because of the risk of bleeding and possible complications during delivery.
Understanding what placenta previa means and how your doctor monitors it can make the situation much less frightening.
What Is Placenta Previa?
The placenta is the organ that develops during pregnancy and provides oxygen and nutrients to your baby.
Normally, the placenta attaches to the upper or middle portion of the uterus. In placenta previa, the placenta is positioned unusually low in the uterus and may partially or completely cover the cervix—the opening through which the baby would normally pass during a vaginal birth.
You may also hear the term low-lying placenta.
These terms are related but are not always interchangeable. A low-lying placenta may be close to the cervix without actually covering it, whereas placenta previa generally refers to a placenta that covers the cervical opening.
The exact position and distance from the cervix become particularly important later in pregnancy when your doctor is planning delivery.
What Are the Symptoms of Placenta Previa?
Some women with placenta previa have no symptoms at all and the condition is first noticed during a routine ultrasound.
The most typical symptom is:
Vaginal bleeding during the second half of pregnancy
Bleeding associated with placenta previa is often painless and can be sudden. It may occur later in pregnancy and can sometimes be heavy.
However, not all bleeding during pregnancy is caused by placenta previa. Vaginal bleeding in pregnancy should always be assessed by a healthcare professional rather than assumed to be due to the placenta.
If you have been told that you have a low-lying placenta and experience any vaginal bleeding, contractions or pain, contact your maternity unit or healthcare provider promptly.
What Causes Placenta Previa?
In many cases, there is no single identifiable reason why the placenta implants in a particular location.
However, placenta previa is more common in some situations, including:
- Previous caesarean birth
- Previous surgery involving the uterus
- Fertility treatment
- Smoking
- Certain other pregnancy and uterine factors
Having one of these factors does not mean that you will develop placenta previa.
A previous caesarean is particularly relevant because a placenta that implants over or near a previous uterine scar can also increase concern about placenta accreta spectrum, a separate condition in which the placenta attaches too deeply to the uterine wall. If this is suspected, additional specialist assessment may be required.
How Is Placenta Previa Diagnosed?
Placental position is routinely assessed during the pregnancy ultrasound around 20 weeks.
If the placenta appears low at this stage, your doctor will usually recommend a follow-up scan later in pregnancy rather than immediately assuming that placenta previa will persist.
A transvaginal ultrasound may be used to determine the exact relationship between the placenta and cervix. This is considered a safe way of assessing placental position during pregnancy.
The important point is that one ultrasound showing a low placenta does not necessarily mean you will have placenta previa at delivery.
Can a Low-Lying Placenta Move During Pregnancy?
Yes—this is one of the most important things to understand.
When a placenta appears low at the 20-week scan, it often ends up farther away from the cervix as the uterus grows.
Strictly speaking, the placenta does not usually “move” around the uterus like a separate object. Rather, as the uterus expands, the relationship between the placenta and cervix changes.
RCOG patient guidance notes that most women who have a low-lying placenta at the 20-week scan will no longer have a low-lying placenta at follow-up.
That is why follow-up imaging is so important.
How Is Placenta Previa Monitored During Pregnancy?
If your placenta is found to be low at the routine mid-pregnancy scan, your doctor may recommend another ultrasound later in pregnancy.
RCOG guidance describes follow-up assessment around 32 weeks, with another scan around 36 weeks if the placenta remains low. A transvaginal ultrasound may be used when a more precise measurement is needed.
Your monitoring plan may vary depending on:
- How close the placenta is to the cervix
- Whether it covers the cervix
- Whether you have experienced bleeding
- Your previous pregnancy and surgical history
- Whether there are concerns about placenta accreta
- Other pregnancy-related factors
Your doctor may also monitor your haemoglobin because repeated or significant bleeding can contribute to anaemia.
Can You Have a Vaginal Delivery With Placenta Previa?
This depends mainly on where the placenta is located near the end of pregnancy.
If the placenta continues to cover the cervix, a vaginal birth is generally not considered safe because the placenta can obstruct the baby’s passage and significant bleeding can occur.
In confirmed placenta previa, caesarean delivery is generally planned.
However, a placenta that was low earlier in pregnancy may move sufficiently away from the cervix to allow a vaginal birth.
For women with a low-lying placenta that does not cover the cervix, the decision about mode of delivery depends on the exact placental position and the individual’s clinical circumstances. RCOG guidance uses the distance between the placental edge and the cervix, together with other clinical and ultrasound findings, when considering the safest birth plan.
So, being told at 20 weeks that your placenta is low does not automatically mean you will need a C-section.
When Is a C-Section Planned for Placenta Previa?
If placenta previa persists into late pregnancy, your obstetric team will discuss the timing and method of delivery with you.
For uncomplicated placenta previa, RCOG guidance recommends considering planned caesarean birth around 36–37 weeks, while earlier delivery may be necessary if there has been significant or recurrent bleeding or other complications.
The exact timing is individualized.
Your doctor may consider:
- Previous episodes of bleeding
- The amount and frequency of bleeding
- Whether contractions or labour have started
- Placental position
- Baby’s condition
- Other pregnancy complications
- Distance from the hospital and access to emergency care
The purpose of planning is to balance the risks associated with continuing the pregnancy against the risks associated with delivering the baby early.
What Should You Do If You Have Bleeding?
This is especially important if you have already been diagnosed with a low-lying placenta or placenta previa.
Do not wait at home to see whether the bleeding stops.
Contact your maternity hospital or obstetric team immediately if you experience vaginal bleeding during pregnancy. If the bleeding is heavy, you feel faint or weak, or you have other concerning symptoms, seek emergency medical care.
Even if you have had no previous bleeding, placenta previa can sometimes cause sudden and significant bleeding.
Your healthcare team may assess:
- The amount of blood loss
- Your blood pressure and overall condition
- Your baby’s wellbeing
- Whether you are having contractions
- The position of the placenta
- Your haemoglobin and blood group when appropriate
The exact assessment will depend on your pregnancy and symptoms.
Does Placenta Previa Affect the Baby?
The main concern is usually related to bleeding and the possibility of preterm birth, rather than the placenta itself directly harming the baby.
If significant bleeding occurs, or if delivery needs to happen earlier than planned, the baby may be born prematurely. Your obstetric team will therefore monitor the pregnancy carefully and may discuss additional measures when early delivery becomes a possibility.
If placenta accreta is also suspected, additional specialist planning may be required because of the risk of major bleeding during delivery. This is particularly relevant when placenta previa occurs together with a previous caesarean scar.
Placenta Previa vs Low-Lying Placenta: What's the Difference?
These terms can be confusing.
Low-lying placenta: The placenta is positioned close to the cervix but does not necessarily cover it.
Placenta previa: The placenta lies over the cervical opening.
A placenta described as low at the 20-week scan may no longer be low later in pregnancy. Therefore, the diagnosis and delivery plan should be based on the placental position later in pregnancy, not only on an early scan.
Frequently Asked Questions
It can be a serious pregnancy complication because it can cause significant vaginal bleeding, particularly later in pregnancy. However, careful monitoring and planned delivery allow doctors to prepare for these risks.
If the placenta continues to cover the cervix near delivery, a caesarean is generally recommended. However, a low placenta diagnosed earlier in pregnancy may move sufficiently away from the cervix, allowing vaginal delivery to be considered.
A placenta that is low at the mid-pregnancy scan often becomes positioned farther from the cervix as pregnancy progresses. Follow-up ultrasound determines whether it remains low.
This depends on your individual circumstances, particularly whether you have had bleeding or whether the placenta is covering the cervix. Ask your obstetrician for personalized advice rather than assuming that sexual activity is safe.
Not necessarily. Most low-lying placentas identified around the 20-week scan do not remain low later in pregnancy. The important thing is to attend the recommended follow-up scans and follow your obstetrician’s advice.
A Final Word
Being told that your placenta is low can sound alarming, but a low-lying placenta identified during the middle of pregnancy does not automatically mean that you will have placenta previa at delivery or require a caesarean birth.
What matters is how the placenta is positioned as pregnancy progresses and whether you develop symptoms such as vaginal bleeding.
Regular follow-up ultrasound, awareness of warning signs and an individualized delivery plan are important parts of managing placenta previa.
If you have any vaginal bleeding during pregnancy—especially if you have been told that your placenta is low – contact your obstetric team promptly rather than waiting for the bleeding to settle on its own.