Can you get pregnant while exclusively breastfeeding?

I just read that your chances of getting pregnant while exclusively breastfeeding is 2%, we were going to try for a second baby after I had this one because you’re more fertile after you have a baby and it took us a while to conceive this one... I’m heartbroken. I want to breastfeed my LO until he’s atleast 1 but I didn’t know that meant giving up having a second baby until I’m done... anyone have any success getting pregnant while exclusively breastfeeding? Thank you...