I personally would not. I know it sucks right now but ABBB is really good! I got BBBC last year, got predicted AAA for A2 and now have an offer for Durham and Warwick. Waiting on the 18th to know whats happening!
To go cambridge, those results are not ideal (however i do know someone who got in for an A*AA course with ABBB at AS, psychology or something). It depends where you want to go and what you want to do.
Drop one of the Bs, weakest one would be best, work hard at A2 and remember how you feel now. Work to not feel it again (: Its more than possible to go up one grade at A2.
Best of luck!