Spotting?

Jennifer

I got my iud out last October. Prior to my cycles were 30-32 days, 6-7 days bleeding o in the middle. While on the iud I stopped having periods. Now, my cycles are 26-27 days, 5 bleeding. So this cycle I had spotting (brownish reddish) on cd 12, along with hefty cramps the day before and after, which I’ve never had. Any guesses on why, any opinions help