Do you think i am pregnant?

So i started my period jan 2 and had sex on the fourteenth of january and he ejaculated inside of me. he smokes pot every day so i dont know if he is very fertile. i took a pregnancy test on the 29th and it said negative and im supposed to start my period around february third. tonight i threw up but i think its because i over ate because i dont feel l sick. so what do you think? And tell me your personal experience