Could There Still Be A Risk Of Pregnancy When Regular Period Post Intercourse Had Some Changes?

Actually I had an unprotected sex on 6th jan and my previous periods dates was 24dec i got my periods on 27th jan but the flow was light gradually my boobs started increasing in size and i got my peirods again on 23feb with painful bleeding and minor clots so is it normal? Is there any pregancy risk? Because i get regular periods