There are a significant number of med schools that do not consider predicted grades in thier selection processes. Liverpool and Leicester are two for example. They both also accept A*AB if the A*A includes chemistry.
So i would not say they wouldnt invite you to interview with AAC predicted, but you would have to work hard to pull the grades up. You have some time before the med admissions / final exams so not impossible.
The other option might be to look at whether you qualify for any contextual flags, for home or school or bursary, free school meals etc. They all seem to have slightly different definitions of contextual. Then look to see how they apply for A100 courses as well as foundation/gateway med.
Does your school do EPQs in year 13? Its a lot of extra work esp if you need to be focussing on pulling your grades up. But if you do have to do one there can be some flexibility in grades again.
I am not an expert, but I havent really noticed anybody getting in with a C, a B yes esp with an A* but not C.
Good luck.