Postpartum lower back and stomach pains

My daughter was born 10 days ago and I’m healing pretty well down there (vaginal delivery). But the last few days I’ve had lower back and abdominal pain/cramps. My lower back feels so tired and sore like I had been on my feet all day long or something (but after being on my feet for only like 10 minutes). And my lower stomach just feels kind of crampy. I don’t remember feeling this after my first baby and it makes me nervous...BUT I was in really good shape all through my first pregnancy, not so much this pregnancy 😬. Anyone else have similar symptoms after having baby?