Period changes?

My period has been back for about 6 months now, and for the first 3-4 cycles was exactly like it was pre-baby. Period starts, I'd get medium-strength cramps on days 1-2 only, then heavy flow for a day or so, followed by light flow at the end. The last two cycles though have been really weird--still regular, but I have NO cramps the first couple days, it's been heavier overall, and then the cramps kick in like crazy on days 4-5, I feel like I'm popping Advil like candy (not really, but still). Anyone else has these kinds of changes?