Should I go see a doctor?

I had my regular period last week Wednesday (08/17) and it lasted its usual time. However right as it was ending I started having the worst pelvic pain for two days straight. Since then (08/22) I have been spotting a lot. I keep discharging brown crap that looks like old blood. I'm assuming it's still my period, but that means that I've been officially on it for a week and a half. This is not at all common for me as I have been on the pill for 5 years and my period has always been consistently the same. Should I go see a gynecologist? 

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