first of all, welcome to the boards.
I'm sorry to hear you're going through such a tough time and can't really offer any practical advice because I've never been in your situation, but I'm certain that other ladies here who already have children will be able to give you some more insight.
However, if the doctor doesn't seem concerned, surely that would mean it's nothing to be worried about? Just a thought, although I could be wrong, of course.
Let us know how it goes, and good luck!