I got my period August 20th. (It started off brownish, then to my period)

Before I got my period, Aug 19 my bf and I had sex and he finished. Fast forward to August 21st and 23rd my bf finished inside me again. The first time he finished my period started to come out less. Then it stopped. August 24th I only had brown streaks on my panty liner. Now I'm not bleeding. I was wondering is there any chance of me getting pregnant??

My period usually last 7 days. And I'm on the 28 cycle.