I have same problem except mine is blocking the exit door according to my scan at 13 weeks I'm now 20 and go for a scan Monday, she said if it hasn't moved by then I will most likely have to have a csection :(
This is my first baby and I'm already nervous as hell
Hope everything works out for u :)
hopefully as your uterus gets bigger the placenta will move up just that little more and you will be in the all clear :)