Okay guys i need help

I had sex July 4th unprotected , he nutted in me ALOT lol but before I had sex , I was spotting (just on tissue when I wiped) then after that it was like a regular period but now (July 9th) I'm still spotting. The last pt I took was June 27th and it was negative ! Idk I'm paranoid I just want to know should I take another one ? I never had this happen before . (please no negative comments)