My periods are regular and normally last for 5 days and 2-2.5 days are heavy. 28 day cycle. My period in july was from july. 09-14. I had unprotected sex on july. 30, after that i had not done intercourse till today , took I pill(emergency contraceptive pill) on august 1st then I started my period on Aug 11, and completed on 14 aug .and in next month i am not having period till 13 september but on 13 i got very light period and on 15 september period is stopped after that i took regestrone for 3 days that was my gynecologist suggested to me . i also checked 2 pregnancy check on morning on 16 september or also checked thyroid check that was negative or normal respectively and one beta hcg negative on 19 septeber..tell me suggeset me regarding on this..what causes i m having this..i am not having period still now..when will it come