I had sex with my boyfriend tonight. Something happened and the condom broke. He thinks it broke when he did something after he pulled out but I'm still worried. He didn't finish and I'm on birth control. I know pre cum has sperm in it though and it can get you pregnant. We went out and bought plan B just to be safe. Unfortunately, it could make me sick or mess with my birth control. What should I do?! Should I be ok since I'm on birth control?