Last month AF was 4 days late and only lasted 2 days with a regular flow. Usually last 3-4 days and is usually 27-29 cd. Last month was 32 and this month I am 2 days late and on cd 31 tomorrow will be cd 32! I have taken pregnancy tests and they are negative. I have all my symptoms of AF both times. Just not sure what is going on. Not ttc and not on any birth control. Advice please!!