Confused and possibly pregnant

This guy I used to be seeing and I had unprotected sex (withdrawl) on the 4th. My period is not due for another week but about a week ago I started getting PMS symptoms. It was too early for it to be related to my period and it hasn't stopped. I've been really naseous and everything smells extra strong. On top of that I'm more exhausted than ever. My breasts are sore if I press on them. I've been cramping and my CM is getting thicker and producing more. It was a milky white before but now it's pinkish /brownish tinted. I know a missed period is the best indicator but I'm just worried. Any help would be appreciated. Thanks