Hello Well I Started My Period On 6/3/15 And Had

Hello well I started my period on 6/3/15 and had protected sex on 6/21/15. Probably less than 10 minutes and I helped him after that. I started my period on 7/1/15 and it was a normal period that lasted 5 days. I am not on birth control. Is their a chance that I may be pregnant because it was a mistake .? And I feel normal no symptoms at all I'ts just in my head that I made a mistake. Do I go see a doctor or get a test?? My next pap smear is 8/24/15.