9 weeks postpartum, no period formula fed

I'll be 9 weeks postpartum Tuesday and havent had a postpartum period yet. My son is formula fed and I had a vaginal birth, quit bleeding around 2-3 weeks postpartum. I have the crampy feeling daily like I need to start but cant or havent yet. Anyone else dealing with this? Starting to think my hormones are messed up. I still have a belly pooch still and I have melasma on my face/lip 😣