Chance of pregnancy?

Ive been on birth control for two months now, in fact i took my last active pill yesterday. I am very diligent in taking my pills the same time everyday, if not 30 minutes later than usual. About a week ago I had unprotected sex, however he pulled out and claims he did not ejaculate in me.

Today I checked my underwesr and saw that there was white discharge with very little pink spots in it. Could I be pregnant?