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A 41-year-old member asked:

Doctor says placenta is previa now at 16 weeks but might migrate. how can it move like that?

2 doctor answers4 doctors weighed in
Dr. Miguel Cano
Obstetrics and Gynecology 30 years experience
It doesn't: As the uterus grows, it pulls the placental implantation with it. It's like placing an ink dot on a deflated balloon...Blow it up and the dot "moves" higher, stretched out of the way. A placenta previa is more common earlier on and usually not a biggie unless it's still blocking the cervical outlet after 24 weeks. Make sure you get checked after 24 weeks and tell your doc about any bleeding.
Dr. Brian Nguyen
Obstetrics and Gynecology 11 years experience
Uterine stretching: Previa: Placenta overlies the cervix/birth canal. Gr 1 means placenta is close, Gr 4 means it's directly overlying/blocking the baby's exit -- high chance of preterm labor & bleeding; you'd need a C/S at 36-37wks. More common in woman w/ hx of C/S & smoking. Not much you can do but wait. If dx'ed early, the uterus still grows/stretches and a placenta can migrate away even in 3rd tri. Follow w/ US.

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Last updated May 30, 2015

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