I have been on the NuvaRing for just about a month now - I'm due ...

I have been on the NuvaRing for just about a month now - I'm due to take it out tomorrow in order to have my period. I haven't had any horrible side effects that I've read about here, but I have had brown discharge. No pain, but brown discharge, sometimes pink...Is this normal? I was just at the OBGYN and she said everything was normal, but I haven't heard anything about brown discharge. The only problem with this is that it's ruining my panties! :)