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i was really drunk and i had sex with some guy i didnt really know... i told him we needed a condom and he got one.. but the room was filled with fog because he had a fog machine and i couldnt really see anything.. we did it twice.. but im not sure if he took it off after the first time...if the second time was only for a little bit and it wasnt full out sex.. do you think i can get pregnant.. and how will i know