I missed my period for the month of July 20 and I didn't get it until August 5 but I had unprotected sex on July 28 and 31 then again on August 2 and 3 I wanted to know is it a possibility that I am pregnant.

Of course it's possible that you are pregnant, you had sex silly. LOL

All joking aside, any time you have sex, protected or not, there is always a possibility of pregnancy. Unfortunately, you are now going to have to wait to see if your next period comes. If not, then test using first morning urine.