I'm 21 weeks and last week during 20 week US, they thought I had complete previa. I had to go in for a follow up since they couldn't get all of the shots they needed and it looks like either the placenta moved or it was actually a vasa previa (I have posterior low lying place with an anterior placenta lobe). Well they said vasa previa suspected. I'm hoping it clears up and a healthy vaginal birth will be possible. Anyone go through something similar?