Could I be pregnant?

Patient: I had unprotected sex on the night of November 27th, 2013 my ovulation forecast started the next day. My egg was due to drop on the following Monday December 2nd, 2013.My last period was November 18th through the 23rd. I have been experencieing some signs but not sure if it is just my body playing tricks on me. I am due to have my period on MOnday Demember 15th, 2013. I am wondering if i need to go and see my obgyn. If there is a possibility i could be pregnant.