I need to know if I am pregnant or not and if I should go buy a home pregnancy test. I had unprotected sex on the on the 3rd of may he didn't ejaculate inside of me. I just got over my period when we had sex. The day after I ovulated I had brown spotting for about 4 days. Then on the 28 I think I got my period or could it be implantation bleeding because it was light the first day the second day it was red and more now it's the 3rd day of it and it like its going to stop and it's brown and pink. Also my periods usually last about 5 days.

There is NO set of symptoms that define pregnant or not.
Buy a test or two in 2 weeks.