I'm 21 years old and had unprotected sex on Aug. 8th, I was ovulating (didn't know at the time). The next day I took plan b and after a week I've had light pink, brownish discharge and it's so light I don't need a pad. It's gotten a little heavier, but still nothing compared to my normal period and there's no cramps involved and I always have cramps. I've taken plan b before and this didn't happen last time, last time my period was 2 weeks late and just as normal as ever.

 

So is this the plan b or could I possibly be pregnant?