I have never missed a period before in four years it's been between the same days 15-22.This month I haven't started at all.I took to pregentecy test and both came back negtive.I have had unprotected sex in the past months.I'm not under stress or under weight.I also haven't been working out more.I been cramping like I was on period but I'm not.Could someone please tell me what may be wrong.Is it possible I still may be pregnant after two netive tests?

Sometimes mother nature throws us a curve ball and we miss our periods for no reason.

When taking your HPTs did you use first morning urine? This is important as this is when the pregnancy hormone called hcg is at the highest concentration.