What Causes Dark Brown Discharge, Dizziness And Hunger After Intercourse?

i had sex 2 weeks ago with my boyfriend and he cummed in me. and yesterday i discharged a drak brown red color only for a few mintues then it went away and came back in the same day. now today it was a verry light redish pink and me and my boyfriend had sex and it went back to discharging brown red color now im not discharing. i been throwing up boobs hurt getting dizzy mood swings crying for no reason getting really tired and being hungry all the time and im never hungry can i be pregnant