My last menstrual cycle ended last December 18, 2011. Since then, I haven't had my period. I have no idea why. It used to be pretty irregular, usually late by a week or so, but never like this. I don't take pills or inject any hormones or take some kind of special medication, if that's relevant. The closest I ever got to a sexual experience happened about a full year ago, so I'm quite certain I didn't get pregnant from that. In fact, I've actually lost 25 pounds since that "sexual encounter" (no, I don't think it was because of some kind of freaky disease, I just radically changed my diet and finally got around to some semblance of decent physical activity). This would all be fairly reasonable, unless, of course, I was somehow brain-hijacked and actually delivered the baby last December. Actually, even that won't explain my situation right now. A pregnancy from a different encounter, perhaps? (Quite regrettably) I haven't even kissed a guy in a year. But my virtually nonexistent sex life is another story for another day. So, any thoughts?