Oh Amber,
I have no answers I will leave that up to the other very knowlegable people on here. I couldnt read this and not post.
Firstly Congrats on the pregnancy. I hope it all goes well for you and they put your mind at rest.
Secondly I would have thought if that scaner thought there was a problem with where the embyo had implanted they would have done further looking.

I hope it goes well, good luck tomorrow