TTC question?? 10 pts best answer?

My husband and I have been ttc my last period was on June 14, 2011. We had sex on June 23,24 skipped the 25, sex on 26, 27, & 28. No sex today June 29th. Can anyone tell me by those days given is pregnancy possible? Should we continue to have sex a few more days or are my fertile days over. THANKS 10 pts for best answer ;)