wouldn't the having unprotected sex be a pointer? that'd freak me out, too! hmm.. wiki says home pregnancy tests are only accurate about three weeks after the actual intercourse. You slept with him friday night.. hey! there are emergency contraceptive pills for up to three days after. If you're really freaking out, get one of those quick.
I actually have a spare with me in case I ever mess up.
I should add that it is no substitute for using condoms and being on the pill, but I don't think you need the lecture.

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