Too soon?

I am on birth control, and for some odd reason my vagina reacts terribly to all sorts of condoms, so we don't use condoms. We completely rely on the pill. February 10th, I missed the pill and we had unprotected sex. Usually he pulls out, but this time he didn't. It's been 13 days since then and I just started my period. Is it too soon to skip a period or am I just not pregnant after all?