Okay so i had sex three times about 2-3 days before ovulation and my boyfriend says he has this feeling i might end up pregnant . could this be true ?

Sure: If not wanting to get pregnant, a woman can consider doing one or more of the following: stop having unprotected sex, stop having vaginal sex, buy Plan B if there was unprotected sex in the past 3 days, ask her doctor about getting an IUD placed if not already pregnant, ask her doctor for a prescription of Ella (ulipristal acetate) if there was unprotected sex in the past few days, etc...