Just need a word of assurance (Ex having a new baby)

So today I found out my daughter’s father is having a baby with his wife. And I’m genuinely happy for them as I know they’ve been trying since they got married 2 or so years ago.

But I also feel super anxious. I guess I have childhood trauma. I was never claimed by my father and I remember feeling so sad that he raised his daughters with his wife so lovingly and I never received any of that. I don’t know how it will be with her father but I’m so afraid she’ll be pushed aside while he raises the baby he has with his wife. She’ll be forgotten about. I don’t know if that’s rationale but I’m so nervous for my baby. She said “Mama, I don’t know how to feel” when I asked her if she was happy. I know I might just be being overprotective but is it normal to be worried? Can someone just tell me it’ll be okay? I’m so happy for her to experience having a sibling but I’m just worried she won’t be included either. 😔