Possibly pregnant

How easy is it to get pregnant after a baby? I’m 8 weeks PP. my husband and I started having sex at the 5 week mark without protection. There’s been some oopies where he almost didn’t pull out in time. I still haven’t had a period since birth 8 weeks ago and I don’t breastfeed. My baby is formula fed. I’ve been having a lot of watery discharge too. My husband and I would be extremely happy but scared