So my boyfriend and I were having sex, he came the first time (on me). The second time/round (probably 20 minutes later) we heard the condom pop and immediately pulled out and stopped. He didn't cum at all the second time. But I'm scared I may have gotten pregnant because it popped or because of precum?? I'm not on any birth control pill. What's the chance of me being pregnant? (Was not fertile when this happened)