Beastfeeding Period

I got my period back at like 3 months postpartum and had I think 2-3 heavy periods but haven't had another since. It just hit me that another month has passed without one (LO just turned 8 months). I'm going to get a test tomorrow just to ease my.mind but is this normal? We've barely had sex since baby and with a condom each time so I feel like it would be super unlikely but you know how it is when you start to.overthink something. I was pumping over night and started breastfeeding overnight so I wonder if.thats why I stopped getting it