no period

I am 2 months pp and not breastfeeding. I immediately started using formula from birth.. with my first two children my period came back at around 5 weeks for both of them. This is my 3rd and it has been 2 months and I still haven’t gotten my period, is that normal? My doctor keeps rescheduling my post partum check up for some reason so I haven’t even got to see her. It’s very frustrating. My appointment isn’t until June 3rd and I gave birth March 30th. 🙄