So my boyfriend and I hadn't seen each other in quite a long time so when we did see each other ( April 1st / CD15 ) we were quite frisky with each other and even though we had protected sex 4 out of the 5 times, we did use the withdrawal method once. He didn't come either. I'm on the pill but on that given week I was also on antibiotics so it's probrably nothing but I'm still in school so it's not exactly practical.