Carrier of cystic fibrosis. Confused 🤔

I just got a call from my doctors office & the nurse told me I’m a carrier of cystic fibrosis? She said the father of my baby needs to be tested next week. can someone tell me what this means because I’m very confused? I had a previous pregnancy with the same guy who is the father of my baby now, I was never told I’m a carrier 🤔