Can i get pregnant if im still breastfeeding??

Hello ladies!!!

My question, I have a handsome lil boy who will be two in March. I'm still currently breastfeeding him at night. My SO and I wld like to get pregnant early next year. He was told that since I'm still breastfeeding that I won't be able to get pregnant. Since the birth of our son, I never got back on BC and we have had unprotected sex and nothing ever happened. We took no procautions and I never became pregnant. I know my OB has said breastfeeding won't stop pregnancy but now I'm starting to wonder. Am I grasping at straws?!?!? We have unprotected sex. No BC, and still no Pregnacy. Is the fact that I'm breastfeeding hindering my chances of future children?!?!?!