Hi Natalie — Thanks for your question and I feel your frustration!
You are correct in that the uterus is always growing so when an early ultrasound shows a placenta that is either a complete or partial previa, it is quite possible that as the uterus grows it is no longer covering the cervix.
At 31 weeks, it sounds as though it has moved but your doctor is concerned that you could have bleeding if there is an edge of the placenta still too near the cervical os. It is impossible to know when your baby’s head will engage but I do agree that an internal ultrasound will be more accurate.
I completely understand your desire for a vaginal birth. I believe that your doctor is pushing for an ultrasound at 36 weeks because you could go into labor before 38 weeks and he wants to have a clear understanding of what your plan of care should be.
I wish you the best and please let me know about your birth!
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