To delay my cycle, I took 2 doses of meprate for 2 days. On the third day I had a core workout post which I started experiencing cramps with light spotting and from next day the flow was heavy like a regular period. How to determine if this was withdrawal bleeding or my regular cycle? Also since I've stopped taking the dose (after the first 2 days) when shall I expect my next period? Just to mention my period cycle has always been regular (31 day cycle) and core workouts always have had an impact on preponing my cycle by 1-2 days.