Postpartum...

I just had a baby 8/24/17. So my baby will be 6 weeks on Thursday. Me and his dad have been having unprotected sex, but he hasn't ejaculated any of the times. I'm also breastfeeding. What are my chances of pregnancy? I'm scared to death to get pregnant again because I react to pregnancy horribly, and I don't get my birth control for another 2 weeks.