ok i have not had my period for a good 9 weeks now, i have been having sex on a daylie basic but only around three weeks ago we stopped using protection and me and my partner was talking about how i have not been on. then that night we had intercourse and there was blood just for that night and then i have not since bleeded? i have had a bad back and being really moody i have done one test but said neg??? i train six days aweek as a runner so.........? plzzzz help