I had sex last night with my hubby which is unprotected . My periods is due on 22 aug n had sex before 7 days before my due date .Is there any possibility of getting pregnant.what are the syntoms?

There's always a possibility of pregnancy during sex.

Yes, there is a chance, there would be a chance although smaller if you had used protection. But you are married, so are you trying for a child ? Most married couples would be having sex on a regular basis, so why are you worried about just this one time ?