Second baby coming

My daughter is 16 months and we are due with my son in July. I’m starting to get excited to meet him but I can’t help but feel sad these are her final weeks being the only child. I feel like I bonded sooooo much more with her while I was pregnant. Don’t get me wrong I’m very excited to have him, I’m just so scared because I don’t have that same strong attachment yet. Like I literally feel so bad saying that. He was totally planned too. I guess what I’m saying is I’m afraid I won’t be as attached to him as my daughter. Anyone else go through this? It’s literally giving me high anxiety to have to leave my daughter for a few days to be in the hospital. Does the bond come when he arrives?