What are the chances?

so my last period started April 19 and so my ovulation should be over already. So today I gave my bf head and made him go, then we had a little quicky and he pulled out, and then later we had another but he accidentally went in me a little, but it was the least since we've done stuff three times. Im on birth control and I take it regularly but we didn't use condoms. So what do you think?? Chances?