I had placenta previa with my first pregnancy and unfortunately mine didn't move. A lot of people are told their placenta is low at 20 weeks but most of them move. At my appointments towards the end the midwives always seemed surprised that mine hadn't moved at all so I guess that shows that there aren't that many that do stay too low for a vaginal birth.
Sorry this doesn't really help, just my experience. I hope for you that's at your next scan it has moved far far away! I hope it doesn't stress you out too much and you can enjoy the rest of your pregnancy xx


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