Can I be pregnant from having sex with a ziplock bag as a condom?? It never broke and he never pre cum. Also he rubbed his penis on my vagina back and forth but he might have had apre cum on It. Can I be pregnant from that? Also we didn't have sex long. We just put it in with the ziplock bag on took It out. It never broke or came off. Can I be pregnant from that? please I need a answer