Being deferred and first semester grades -- help!?

Recently I’ve been deferred from one of my top choice schools. Unfortunately, all that’s left to do is send mid year reports, and mine isn’t so impressive. I have two B’s (AP Calc BC and AP Chemistry), and I’m sincerely worried about the affect it’ll have on my deferred application. How much will it hurt that I don’t have a flawless first semester report in my two hardest senior year classes?