positve pregnancy test

umm..soo I was at the doctors and they took a urine sample from me and ran a pregnancy test (though I told them there was no reason to do so).

anyways the test came back positive..but I'm still a virgin and by that I mean I really haven't been no where near a man at all, never. no boyfriend nothing.

My period is also irregular and I sometimes get sudden sharp pains in my tummy..do any of you guys know what could be wrong?