Back pain and cramps - 37 weeks

I'll be 37 weeks tomorrow (yay!) and today have started having a low, dull ache in my back. I'm also having intermittent cramping. Nothing consistent, no blood, leaking, and not getting worse. Wasn't dilated about a week ago. I delivered my first at 25 weeks and they were trying to slow labor but I recall getting backaches about a week out from delivery. Just checking in to see if anyone is in the same boat or if this or previous pregnancies, were early labor for you. Thanks!