Experience from other moms please...

Basically how u know your ready for baby 3? I mean av been thinking still not come up with a decision... I have two kids ages boy will be 5 in April and my girl will b 9 in July... and my now partner doesn’t have any children... I suffer severe aniexty so am scared about labour and 9 months of sickness and weather il love the baby when it’s born? With my other two I was excited about having them and bared with the sickness I need help lol