I Had My Period On The 7th Of August And

I had my period on the 7th of August and had unprotects sex that same day. He didn't I'm inside but ejaculated a little before sex (not in me) and I have irregular periods. My periods last 5 days. After the sex I peed and my period was lighter during those days. And now it's the 8th of September and I feel cramps but haven't gotten my period yet...am I pregnant...?