Hey dr

I am in a great trouble plz help me out
Acutally i had sex with my bf in oct.. thn my menstruation cycle was of 4 nov n in dec 3rd i had again sex with him on my exact date of periods n i took Ipill after an hour bt after nov i haven't my periods yet ... i soooooo worried. Plz plz plz it has already been delaed for 3 weeks..may be nw i cant evn go through home pregnancy test..bt my menstuation cycle is always irregular it delays 4-5 day comonly nd smtym it delays 10 days also.plz help me out