cramping but not tightening

im almost 30 weeks now and lately ive been getting period-like cramping, maybe once or twice a day for the past few weeks?

its a random occurence, not timable, but deffinately not braxton hicks (get those too but those are a tightening and much different).

this is my second pregnancy and i never had period cramping in my third trimester before (aside from early labor, but those were timeable).

is this normal for a second pregnancy? should i be concerned at all?

im low risk and baby has been healthy and worry-free and measuring perfectly etc