My period was supposed to start Monday and still hasn't occurred although I've been spotting. I had protected sex with my boyfriend Friday, but the condom slipped off before he came. He had checked the condom 10 seconds earlier and it was all good but he noticed right after it slipped off. When we looked in the condom, there was precum in it, but it didn't seem to be outside at all. I've also been stressed since Friday of last week, so that could be delaying it. Do you think I'm pregnant?