So I am on CD14, today according to several apps should be my O day, but I've been testing for 4 days and the lines keep getting lighter, took another tonight and no line at all. Maybe I ovulated way earlier? CD8,9,10 or 11? Does anyone else ovulate that early? Or will my levels rise and fall throughout the cycle? Should I keep testing? I am also experiencing some weird crampy feelings in my low low abdomen, like where my bladder/uterus is. I assume it's my uterus that I'm feeling it in. Some twinges of pain and a sharper cramp feeling than my normal long drawn out achy cramps from AF... Any ideas??