Day 50 no period. neg test. cramping urge to urinate headache. have endo. ttc last period induced by provera (medroxyprogesterone) due to 55 day cycle. what could be?

Anovulation: It sounds as if you've experienced an anovulatory cycle. These are cycles in which the ovary failes to release the egg. This disrupts normal hormonal levels.

Not ovulating: Periods are more likely to be irregular if ovulation does not occur that month. During ovulation, Progesterone levels rise and stabilize the lining in the uterus, 2 weeks later if you are not pregnant then all the tissue comes out like a normal period. If no ovulation occurs, then the lining is not stable and bleeding can be more erratic (like you describe.) if this is a pattern, consult your doc).