Hello Doctor..i Had Sex With My Husband 22nd June And

Hello doctor..i had sex with my husband 22nd june and taken ipill in within 72hrs of our intercourse.ie on 24th. Lastly I got my period on 10th June..again for July month I have to get my periods on 10th r 13th..but I haven't got my periods.i have done pregnancy test its day negative.last month on 26th I consulted the doctor for delay periods she did blood test n confirmed negative pregnancy and gave resgesterone for 5days.2tabs at time total 10tabs..after using regesterone today is 3rd day still I have not got my periods..pls help me..im so worried
Previously I had PC OR prob..3yrs back ..that tym I have taken metformin for 6months..from then my period was normal till now..now the prob started after using pill.. pls advice