Hi m a 24 yr old married women. I have regular menses on 11 every month last month I have taken primolut n 5 mg tab bd for 4 days to delay my periods starting from 10-13oct during this tym I had intercourse wid my husband wid protection n I got my period on 16 Oct but now my periods r 15 days overdue n m in a dilemma whether it is due to the effect of medicine I have taken or something else.