Pain after stretching splits

I’ve been stretching my splits (side and middle) a lot lately, and I have really persistent dull pain and popping in my hip area just below my glutes. (see highlighted area) Is this a sign of progress or should I slow down?

I’ve been stretching my splits (side and middle) a lot lately, and I have really persistent dull pain and popping in my hip area just below my glutes. (see highlighted area) Is this a sign of progress or should I slow down?