Jealous of friends pregnancy?

So I just had a baby 2 months ago(first child)

I don’t want another baby right now, because one is more than enough. But one of my best friends just found out she was pregnant and I’m so jealous because I miss being pregnant so much. Like the jealousy is turning to hate. And I have absolutely no idea why. I’m happy for her, but when I keep seeing all their posts of ultrasounds etc. I can’t help but get super jealous. Is this normal? Ps: I swear I’m not trying to be an asshole about this, I really am trying to be happy for her.