brown discharge and early blood

The last day of my period (it was so light like nothing) I had sex. We used a condom. He removed the condom and came on my stomach. About a week after (when my ovulation should occurr) I started getting brown discharge it's been going on for a week. Now today I have cramps and had some blood. My period isn't suppose to come for another week. What does this all mean. I am on the pill is this normal. I am freaking out