Do you ever really know when you're done?

     The other day I was reading this blog post here and it got me thinking. My husband and I have had the discussion about how many kids we will have and he's pretty open, so I think for the most part it's up to me. I've heard some women say when you're done you will just know, and I'm wondering if that's true. I've had c-sections, so they always ask if I want my tubes tied, and I just feel like that is so permanent and how am I suppose to know if I don't want anymore kids before I even have the baby in my arms.
     I've always wanted a big family since I was an only child and I always dreamed of having siblings. I know three kids is big to some people, and who knows maybe I will decide it's big enough for me but it's too soon to tell. Rory is only almost 7 months so I would definitely wait awhile, but I don't want to wait too long since my kids are so close in age I wouldn't want the next one to be like five years later. If for whatever reason that did happen I'm sure it would be fine though. I guess I just wonder if you definitely knew you were done or if you feel the same way?
     I'm indecisive by nature, so I guess it's good two of our children were surprises otherwise it could have taken years to make a decision because I always go back and forth. At first we were talking about maybe trying when we can move, but then I think what if we still can't sell our house in 3 years should I really let that stop me from having another kid. Then I think maybe it will be nice to have three kids who are more independent and not carrying baby stuff all time. As soon as I see a newborn though my mind changes and I can't imagine not having another one. Crazy, I know since Rory is just 6.5 months but hopefully I'm not the only one.