please help

so right after the day i was ovulating i had unprotected sex with my bf. it was just 6-7 strokes only the tip and before that i wiped anything that he had on. i am so scared because my period should come today or tomorrow and i just got a really light stroke of brown on my underwear. On my first day of period i usually bleed really much and i’m actually terrified . i have pms but its so similar to early pregnancy. let me know if you have been in my situation