I use the app to keep track of my cycle: I was scheduled to start Thursday the 1st. And every week it is KNOWN I start the last 2 days of the month. However my cycle did not come. So I marked period late. I was scheduled again for Monday the 4th.. Again late. I am scheduled today, but I am not confident that i will start. I am now a week late today. I took two pregnancy tests at different times..  both came out negative, however I've shown signs that could mean my menstrual will start. Sore Breast, EXTREMELY sore, as of this morning it's no longer in the nipple area it's the entire breast that is sore. Phantom cramping (that's when I think I'm gonna start but nothing) fatigue. And just recently mild headaches.