Baby number 2?

We’re considering having a second baby but I’m really worried about losing precious time with my baby. She’s 7 months old today and I’d love to give her a sibling (she’s very social and active, I think she’d love it) but I worry that a gap of 18 months is too small and she’ll be deprived of 1 on 1 attention and I won’t be able to respond to her needs. We also (safely!) cosleep and she nurses throughout the night so I’d have to work through that. Would I ween her of night nursing? Is that traumatizing? I will not sleep train so what are my options? Anybody with this age gap? Thoughts? Do you regret it? Do you like it? I just want to do what’s best for our family and my little one above all. We’d rather do it sooner rather than later because while we love babyhood, we want to move on with our lives.