Low-Lying Placenta in Early Pregnancy
Finding out your placenta is low-lying at your 20-week scan can be worrying, but it is very common and usually resolves on its own. As the uterus grows during pregnancy, it stretches upwards and carries the placenta with it, meaning most low-lying placentas are clear of the cervix by the third trimester. Understanding the process reduces unnecessary anxiety.
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What a Low-Lying Placenta Means
A low-lying placenta is one that is situated near or covering the cervical os (the opening of the cervix). At the 20-week anomaly scan, up to 15 percent of placentas appear low-lying, because the lower part of the uterus has not yet expanded. If the placenta covers the cervix, it is called placenta praevia, but this label is not usually applied until the third trimester, as the position is so likely to change. The main symptom to watch for is painless bleeding, which should always be reported.
Monitoring and What Happens Next
You will be offered a follow-up scan at around 32 to 36 weeks to check the placenta's position. For over 90 percent of women with a low-lying placenta at 20 weeks, it has moved up by the third trimester. If it remains low at the follow-up scan, your team will discuss a planned caesarean section, as a vaginal birth with a placenta covering the cervix is not safe. You may also be advised to avoid sex and report any bleeding promptly. Most women deliver safely, just by a different route than planned.
Frequently Asked Questions
1. Will my low-lying placenta move on its own?
For over 90 percent of women, yes: the placenta moves up as the uterus grows.
2. Can I still have a vaginal birth?
Usually, if the placenta has moved clear of the cervix by 36 weeks. If not, a caesarean is recommended.
3. Should I be worried about bleeding?
Any bleeding in pregnancy should be reported. A low-lying placenta can cause painless bleeding, so prompt checks are important.
This article is for informational purposes only and does not constitute medical advice. Always contact your midwife, GP, or maternity unit if you experience bleeding or pain in pregnancy. In an emergency, call 999.
Further reading:
Related articles:
- subchorionic-haematoma-recovery.md
- waters-breaking-early-pregnancy.md
- bleeding-after-sex-early-pregnancy.md