am i pregnant PLEASE HELP

about 10 days ago i had sex without a condom but my partner pulled out long before he finished. i’m on the pill. the next morning i threw up my pill then waited a couple hours to take another one. now i’m having spotting and light cramping. i’ve experienced this before on birth control because i skip my placebos but i am paranoid this might be implantation bleeding. i’ve already taken a pregnancy test which was negative but i know it was too early. please help!!