So, my hubby and I have been ttc since June. My last period ended on aug 4th. I have always had longer cycles, and never been like clockwork. But I could normally tell around when my af would be. According to glow, my af should have ended around 12 days ago, but I have yet to have it. I have had some cramping (more like sudden sharp little pains, not normal af cramps)  and upset stomach, funny taste in my mouth and a cold. I have taken multipul tests over the last 12 days and all have come up degative. I'm very confused! Even though I've always had long cycles, I've never actually missed af all together. Opinions?