I definitely know people who believe in a "a quiver full" -- I would imagine that is where they fall.
See Psalm 123: 3-5
Behold, children are a gift of the LORD,
The fruit of the womb is a reward.
Like arrows in the hand of a warrior,
So are the children of one's youth.
How blessed is the man whose quiver is full of them;
They will not be ashamed
When they speak with their enemies in the gate.
I know people who believe that it is God's decision about how full your quiver is. They don't use birth control. One of my gf's is a great testament to this lifestyle - every time God blesses them with a new child, her husband has received a hefty raise and/or promotion
websites and books are devoted to this philosophy
QuiverFull .com