What Causes Feeling Of Bloating And Brown Vaginal Discharge Post Unprotected Sex?

I recently had my period at the first of the month I had unprotected sex with my fiancé on March 9 after I got off my period, I ve been taking the depo shot and i was due for another shot on the 11 I had sex 2 times since the 11th once he put a condom on to finish and the other time he didn t use one at all, but did pull out I know that PC has sperm in it but Now I ve been feeling bloated, had headaces, a reddish brown discharge, cramps, and fatigue. What could this be?