Normally as your pregnancy progresses the placenta moves upwards, away from your cervix. However, if it stays low in your womb it may cover part or all of your cervix and block the baby’s way out.
Placenta praevia
Most low-lying placentas found at the 20 week scan will change position by the time the baby is born. If your placenta covered the cervix at your 20 week scan, you'll be offered another scan at 36 weeks to check. If it’s still close to the cervix, there could be problems with the birth.
If the placenta is still covering the neck of the womb, your baby will need to be born by caesarean section to prevent you having a serious bleed. If the placenta is close to the cervix but not covering it, your doctor will offer to check its position using ultrasound scans at one to two weekly intervals. If you start to bleed, you will need to go into hospital.




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