okay, that's what my two friends thought. she was never getting preggers and he was never pulling out. now she is 16 weeks preggers.
aside from that, pregnancy test, the cheapest one is as effective as the expensive ones, as per a pharmarcist, and if she's got your bun in her, then you can have abortions, but if you're against it, not much to say. you're having a kid, if she's positive. but it's also completely normal for girls periods to be fucked up at that age.