Postpartum periods?

Has anyone had their first postpartum period? I’m 4 weeks PP and was riding a blissful high until suddenly pms-like symptoms arrived over the past day or two. Anger, anxiety, depression. It’s not debilitating but feels like I used to before my period. Just hoping it is PMS and not PPD or something starting. I had awful prenatal depression that disappeared as soon as I gave birth so im hoping this is PMS… lol

I’m also primarily formula feeding as I have very little milk supply so that may mean it shows up sooner?