How do you know when your family is complete?

This is something I have been asking myself, almost daily, since Brayden was born in August. It seems like so many of my friends "knew" that they were done and I feel so uncertain. It doesn't help that I get asked almost daily " Are you guys planing on more children"?

Before we had Charlotte, Tim and I honestly thought we only wanted one child. Literally, the day we came home from the hospital with her we both declared we wanted another baby within the next two years. Brayden fell exactly into that time frame, fitting our plan perfectly. When I was pregnant with Brayden, I started to think "Is this my last time being pregnant? Will I know after he is born that our family is complete?' The answer: I still don't know!

At first Tim was adamant about only having two kids, after all three is a game changer. But then the night before my C-section we had a noncommittal talk about not being sure that this was the last time we would get to experience all the emotions that come with a new bundle of joy! Now here I sit, 4.5 months postpartum, honestly thinking about another baby. Is this hormones? Am I crazy? Or are three kids in the cards for us?

There are certainly advantages and disadvantages to each. This is a little bit that goes through my head almost every day:
+ If we have more kids, will we have to move? I love my house and don't want to move.
+Is is OK if kids share rooms?
+ I'll have to get a minivan (I have actually already accepted this as my fate with two)
+ Will we be able to vacation/ do fun things as easily with three?
+ I really love the idea of having a big family.
+ I want to be pregnant and snuggle one more newborn.
+ I have two amazing kids, why stop there?
+ Some days I feel overwhelmed by 2, will I be able to handle three?
+ If we do have a third, should we have them close together or wait till Charlotte is in Kindergarten?
+ Are the grandmas up for watching three kids?

I keep telling myself, I don't NEED an answer now. I don't have to know NOW... I am still young (enough). After all, I have an infant still. But my type A personality gets the best of me! So I guess my question is: Did you know when your family was complete? If so, how?