Chances of getting pregnant while breastfeeding?

I am exclusively breastfeeding my 4 month old. I still have not had a period since PP, and since I know the chance of getting pregnant is low, there’s a lot of times me and my boyfriend have not protected. But yesterday I had a weird feeling that I used to get in my ovaries when ovulating, so tonight I took an ovulation test just to make sure and I’m pretty sure this is a positive ovulation test?! Which kind of freaks me out because we did it twice tonight not protecting. Has anyone got pregnant exclusively breastfeeding? I know we should have been safer and should never rely on breastfeeding but I’m hoping I’m not already too late