FTM- how to deal with these emotions 😞

I’m about 4 weeks out from being due and I just realized today these are my boyfriends and I’s last weeks as just us two. We’ve been together for 4 years and are barley over 20 and I can’t help but thing how much this will change our “get up and go” lifestyle. It’s never going to be just him and I again. I’m beyond grateful and wouldn’t change a single thing but jeez! I didn’t expect to feel this upset about it. I was looking at our old pictures and got extremely upset for some reason. Should I not be feeling this way? I do not regret getting pregnant and we have always talked about starting a family. I feel bad feeling this way. I’m sad it will never just me him and I again. It won’t be about just me or him, his main focus won’t me me and mine won’t be him. Which obviously I would never expect either of us to not put our child first. It’s just upsetting for me to think about it that way.