For moms who EBF who got their periods before they weaned, was your period while breastfeeding the same as your period after you were no longer breastfeeding?

I used to have really horribly painful periods prior to pregnancy and so far 2 periods PP while still EBFing have been mild. The first OTC drugs worked (they never did before) and the second I didn't have to take anything. I'm hoping this isn't a fluke!