Falling after birth?

Hi guys. My baby is 6 days old. I was up feeding him and changing him, and he spit up all over his clothes so I went to change his outfit into something clean, when all of the sudden I got very dizzy. It felt like I was tripping on something but I hadn’t. I tried catching myself and steadying myself with my feet but the feeling persisted til I fell, baby in arms. Baby is ok. I held him close to my chest and he was completely unfazed. My husband came and took him and made sure he was ok and he has his doctors appointmenttomorrow so I’m going to have the doctor make sure he’s ok, but I am wondering what possibly could have caused this and if it has anything to do with postpartum or if I should consult a doctor about other possible reasons? I’ve only ever experienced that feeling while I was pregnant early in my third trimester and was assured it was just a part of pregnancy. Any help or suggestions would be great!