I am 26, my girlfriend had her last period on 20th June and on 30th June & 7 July we were close but didn't had intercourse. Now she haven't got her period yet which she suspect that it has to be by 19th or 20th july. She has the stomach ache for the past few days but haven't got her period. usually period for 3-4 days. If incase she is pregnant we are not a state to accept pregnancy now so please suggest a way to avoid it.