:  So About A Week Ago I Had Unprotected Sex, But

:  So about a week ago I had unprotected sex, but the guy pulled out right before. A few days ago I started having extreme nausea and have been extremely tired. Today 6 days after the incident with the guy I had my period but it was brown instead of red. (I do have abdominal pain) i don't really keep track of my period, which doesn't really help me much but I would like to know if there's anything I should worry about. Get back to me as soon as possible thanks