Can you still get pregnant if your Breastfeeding

Brenda

I have 3 month old I’m currently breastfeeding about 90-95% exclusively breast-feeding the other 10% sometimes a formula bottle. I’m just wondering if there’s a possibility even though I’m breast-feeding I can still get pregnant the reason why is cause I’m currently six days late, I took at test 5 days ago. It was negative I haven’t taken another on yet.