In April 17,2014 I had unprotected sex and two days after I had sex two more times. I didn't have a period for two months straight. In June and July I had my period but it was very light and most was just discharge. I missed all of August and still till this day September 15,2014 I haven't started my period yet. I have pressure on my vaginal area like cramps. Can I be pregnant?

When you take a pregnancy test, what is the result?

Yes, it may be due to pregnancy, but as Fr_Chuck said, you'll need to take a pregnancy test. At this point, it would be wise to see your doctor for a pregnancy test since you have missed periods, and there can be other reasons that your doctor can check for if you aren't pregnant.