Friend is pregnant, announcements make me feel I will be behind in life?

Hi! My friend recently announced she is pregnant. I (36F) am fence sitting, potentially CF. When I heard the news from my friend I was happy for her, but also felt uneasy. I asked myself if it was jealousy? But I don’t feel jealous or sad, or hoping I was pregnant. I feel more uneasy, because something is changing.

I’ve always had a hard time with change, and I know more people around me will have kids which leads to change in relationships, people, etc. But at the same time I’m happy because I do like kids, and it will be another opportunity for me to hang out with a kid but then be able to go home and do my own thing. But I can’t shake this feeling of being left behind because nothing in my life is changing, even though I think that’s what I want?? Like everyone is doing this new thing, and I won’t be experiencing it, or even a different “new” thing. Does anyone else feel like this?