Hi, I am a 29 y/o femaile that has had regular menstral cycle since I've started my period about 18 years ago. Well, I'm not on any contraceptive, and I am sexually active... Well not long after sex I got my peiod on schedule, but then it disappeard about 2 hours later. It's been 3 weeks and hasn't returened. I've taken 7 pregnancy tests since, and all are negative. I still feel crampy, like it may decide to come, and I've had tiny amounts of spotting, but no full period. Again, all pregnancy tests have been negative. I'm following the instruction by usung my first mornings urine, and still, nagative... can you help???