If you do NOT want to get pregnant get yourself some protection. There's plenty of different contraceptives out there and some places even give them out for free. "My bf/husband/partner had sex X amount of days/weeks/hours ago and he ejaculated in me. Could I be pregnant?" Um, yes there is always a chance. I understand the heat of the moment but let's be mature and get protection. And teenagers, if you don't feel comfortable buying condoms, don't have sex!