i had unprotected sex with my boyfriend 7 days ago, about 2 days after intercourse i was having really bad cramping, the 3rd day after i would urinate i would feel the urge to go again but couldn't i have been having heartburn, really thirsty, and a little nasuea, right above vagina on the left side is a little puffy, and i also have to big blue veins going into my right breast, could this be early pregnancy signs or somethin completely different?