Period pain after giving birth

Hi everyone,

I gave birth to a healthy daughter! Now, 2 months later, I've gotten my period again
I definitely didn't miss that!! hihi

But now I have really bad menstrual cramps... Lower back pain and lots of cramping (feels like mild contractions).
Normally I do get some stomach pain and am a bit grumpy, but this is really different.
I'm also wondering if this is just because it's my first period after giving birth.

Tried Aleve for the menstrual pain, a paracetamol, warm heating pad/shower, but nothing works...
Has anyone else had this much discomfort after giving birth and do you have any tips?