New stretch marks after birth?

Autumn

I had my baby almost five weeks ago. I considered myself lucky because I only got stretch marks on my boobs. Well today I go to get in the shower and I have some angry purpleish ones on my stomach and thighs. Has this happened to anyone else? I guess I didn’t realize you could get them this late after giving birth. Side note in case it matters I gained 40 pounds and have lost 30 of it.