Instant questions and regrets now ttc? Am I alone with this feeling? Desperate for help please!

For as long as I can remember all I have ever wanted to be is a mum, I've waited for the time to come for years and talked about it with my partner who I have been with for years and we have just started ttc this month, I should be happy right? Nothing seems to make me as happy as children always have, what they make me feel is indescribable. But since starting ttc all I can think about is what I will be missing out on. Not too long ago we talked about going back to Queensland for a holiday, we talked about going to Melbourne, I have been talking about going to Melbourne for a concert in July next year with my mother and my sister, just yesterday I went and seen this amazing nature park with waterfalls and gorgeous scenery which was over an hour drive away which has just got me looking at all the other gorgeous places I want to see and so much more.

I honestly don't know what to think anymore, such a big part of me wants children and I have already waited the longest time to be able start ttc with my partner who wants children with me just as much, I don't know if I can wait any longer and most of me doesn't want to wait any longer. But what about this other part of me that wants the complete opposite all of a sudden?

Is this normal? Has anyone ever gone through this, felt different once they had a baby etc? Any words of wisdom, advice, anything would be so appreciated and is very much needed! 😓