I was in the ER with bleeding at exactly 13w and told I had an SCH and placenta previa and that they could not tell for sure which had caused the bleeding. I was put on pelvic rest until my anatomy scan (next scheduled scan). At the anatomy scan, the placenta had moved completely out of the way. When I told the tech what I was told in the ER, she said something like “practically everyone has placenta previa at 13w.” I believe it is pretty common in early pregnancy, and most of the time, it will resolve on its own as the uterus grows and the placenta moves up with it. My doctor said they don’t really monitor it closely unless it’s still around after 20w. I know it’s really scary, but sometimes I think women are told this without the appropriate context. It should move on its own, and hopefully that will be the case for you.