All Brown Period? 😯

I've had a completely brown period this month, with only a few red splotches on the second day. I know brown blood is normal - it's just old blood, but this has never happened during my entire cycle. I barely had any cramps at all, which is very out of the ordinary for me because I have terrible ones. I should be stopping within the next 2 days. I'm on Provera birth control. What's wrong with me? Have I stopped producing blood? I'm getting a bit worried...😖