Sex hurts, Af is late & negative tests

M

Last AF Nov 11-16, ovulated around the 25th, was supposed to get AF 7 days ago. No change is boobs, but occasional diarrhea, wet discharge, mild cramping (maybe gas?) higher up in my left side almost under my ribs today, gas in general, and left side of my pelvis hurts when I’m having sex yesterday and today . Took a test when I was one day late and it came out negative. What could this be? Should I go to the doctor? And when