okay, so i was on birth control, and i went to a party, and drank (i know its bad don't give me any lectures please) and did some stuff with a guy, but not sex, and i think his cum could have gotten down there, but i had my period, it ended two weeks ago, and i didn't go back on the pill, and now i have light brown spotting in my underwear, and i have major buterflies all the time, i feel fat, and i felt nautious but not enough to puke.. could i be pregnant, please reply.