What is this?

I seem to be stuck in another odd period thing. Its now onto 3 weeks and counting. It has never been heavy or enough for a full out pad or tampon just enough to stain your brand new panties UGH! But I don't know whats going on...it started around the same time as last month so its some type of period right? I think another call to the doctor is in order. Who should I see this time? I saw a nurse practitioner last time?