What Causes Irregular Bleeding, Itching Breasts And Mood Swings?

i need help. so i had sex with my boyfriend in the end of january. after that i was fine. but i got my "period" about 3 times last month. now its not coming at all this month. but i feel really sick and my breasts were itchy and i'm moody. i took a test and it came out negative. now i have a brown discharge what is wrong