With your history you should and could be referred to an OB now if you want to see one and he would see you immediately.

I would be going down this path if you can. Doesn't mean you have to stay with the OB all the way through to the birth but it will mean you will get the attention and information you need now, with everything so up in the air.

Once you know what your dealing with there's no reason why you can't go back under the care of a GP (preferably a different one to the one your seeing now!)

Good luck with it all.