Hi I'm 19 and I've been having brown discharge (spotting). I had protected sex on may 18 (condom and it did not break and he did not inside me). I am not taking any birth control meds. I am not supposed to start my period until June 6th so what is the brown discharge?

There are 100's of reasons for brown discharge. So without a real life exam, there is no way to tell. It may be nothing. Condoms while good have a 3 to 18 percent chance of failure, and often you can not see the failure. So pregnancy is of course always an option