Pregnancy with a toddler at home

Currently 6 months pregnant and I have a 19month at home. As I get further along in my pregnancy I can't help but feel that I want some more time with just my son and I. Since he was born Ive had this strong connection with him. I feel sad that soon I won't have as much as time with him. I don't want to take anything away from him or make him feel like he's getting pushed to the side. My husband and I are a great team together so I know we can easily take turns between baby and my son. I'm extremely blessed and excited to have a baby on the way but I can't help but feel a bit sad for both my son and I. Anyone else feel like this??