What Causes Brown Vaginal Discharge And Nausea?

Hi, may I answer your health queries right now ? Please type your query here...Hi, I've been having brown discharge for over a week now, and the past 2 times i had sex with my partner there was a pinkish mucus color when i wiped. I haven't had my period yet and its due anytime and i'm feeling very nauseous today like i'm going to throw up. I don't think I had sex when i was ovulating but I'm not positive.What do you think this is?