Postpartum and maybe pregnant again😩

Ne

So I was reading up on periods in pregnancy because I wanted to make sure I wasn’t going to fall pregnant again and it said in order to get pregnant you have to ovulate and you have to have a period in order to ovulate so I thought I was in the clear because I am five months postpartum and I breast-fed for a couple months but I wasn’t having much luck with that and I still haven’t had a period so I thought I was good but I’ve been feeling nauseous these last couple days I don’t want to stress the hubby out with this conversation so I wanna see opinions first I’m five months postpartum I still haven’t had a period and I stopped breast-feeding like a month and a half two months ago so I guess what I’m asking is how high are my chances of being pregnant again