How Do You Know?

I'm not stressing. I'm not worring. And I'm not thinking too hard about this.. but I am thinking too MUCH about it! How do you know, I mean 110% know for sure that you are ready for a second child? Especially all my friends out there with 2 or more kids?! Where Sum was a surprise baby there was obviously no plan that we had made up yet. We knew that we wanted kids, just not for a while. Raising Summer has been the most rewarding and best thing I've ever done in my life.. I would love to have more. Just not right now. Everyone keeps telling me "Summer needs a sister", "Summer needs a brother", "Summer needs a little sibling", blahh, blahh, blahhh.. YES she does! But I am so not ready. Not even remotely close. I was telling my friend the other day that I just don't feel like we've had enough "Summer time" yet. I'm not worried that I won't love the next as much as Summer like some of my friends have told me they were worried about. I'm not worried about the financial aspect. I'm not worried about how I'd work. I'm just kinda.. blah about the whole aspect of having another one. I don't want my kids to be 5 years apart. And I don't want Summer to be a only child. And I DO, I SO do want to expand my family. But I don't feel like I will be ready for another couple years! What to do.. Anyways, how did YOU know?