hello sir,i had sex on 23rd june 2012 which was 5th day of my period.my boyfriend had just rubbed the tip of his penis over my vaginal orifice just for a few seconds.and after that we had sex wearing condom.for prcaution i had taken unwantd72 within the time period,and within 4 days i.e on 29th june 2012 i had periods again which lasted for 4 days.and then had my nxt period on 27th of july 2012.followed by period in 22nd of agust and 21st of september this mans i am not prgnant right?plz reply