My girlfriend and I had sex for the first time about a month and a half ago. When we were having sex the condom slipped off and I said whatever and kept going and pulled out way before. She got what seemed to be a period about a week or two later. It was kinda early but she's usually irregupar. Then she said she had been feeling really tired. She had also been getting kind of nauseated by food. That went away and now she's fine. She's been getting dizzy lately. She says she can feel her period coming on, and she is due for it, but could she be pregnant?