absolutely normal at least in my case, I also have three super active, loving and beautiful children (all girls :o) and they were born at the same hospital, like yours.
Every time I drive by the hospital where they were born I get such a warm feeling, and then a pang of sadness...
I have a full schedule with the girls; lessons, school, weekend outings etc etc, I cannot imagine adding one more.
BUT oh! they were adorable newborns and holding them for the first time, and welcoming them into our family, knowing they were only mine!
oh I so wish I could do it again but I know in my heart four children would be overwhelming for me...I'm already 36 YO and my youngest is 10 months, no way I would get prego right now, and waiting means getting pregnant at 39 or 40 so I totally get where you're coming from.
If I was younger I would add one more child for sure, I guess it's better this way.
anyways nothing wrong is going on with you, it's part of being a mommy I think :o)