I was on birth control pill with metformin for 3 months, i left the pill. This month I am not getting periods. Last time I had on 9 may, this month more 10 days have passses but no periods. I am having unprotected intercourse since last one month. I am having PMS since last 10-12 days. like light cramp in my abdomen(left),breast tenderness with light pain since 10 days,my stomach feel fuller, 3-4 pimples few days back (Normally i don't get pimple). Sometimes I feel as if I will have periods, but no periods. I am confused, I never had such PMS symptoms. This time I am having but no periods since last 12 days. What may be the reason???