Can my bf still be the father if i had intercourse with someone else?

Hi every one last year I had april fools my bf and told him I was pregnant then may 19th we had unprotected sex and every since then my period didnt come on so in July when I was three months preg I did it with some else and he nutted inside of me I think my question is would my bf still be the father i had sex with some one else?