I had unprotected sex on 16th may.on third day just after my period. Second day I took unwanted72.after some days on 24th may I experienced withdrawal bleeding for 3 to 4 days.i have a cycle of 28 days and I didn't got my periods even after a month of withdrawal bleeding which was 24june. My period date- 9 may (5days) Intercourse day- 16th may Unwanted72 taken on - 17th may Withdrawal bleeding on -24th may Also I did 3 three pregnancy test which came out negative First on-20th may Second on - 11june Third on - 20 june Please please please do tell me what to do My height 5'5 and my weight 90kg also I am 22 years old. No any medication and doing exercise and yoga daily.