I came across this article and I pretty much have to say that it sums up alot of what I have been thinking over the last few weeks.
Be fruitful and multiply - God created us and as one of our primary roles told us to “be fruitful and multiply.” He gave no conditions. He did not say “multiply up to and including eight children at which point you must stop.” At the same time He did not say “be fruitful and multiply until you have exceeded five children.” So there seem to be no hard and fast rules about how many children are appropriate in God’s eyes. Presumably, then, we are able to decide ourselves how many we would like to have. We can assume we should have at least one, but beyond that the Bible is silent. We hear hints that God approves of large families. For example, Psalm 127 says “Behold, children are a heritage from 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. Happy is the man who has his quiver full of them.” However, it is probably safe to assume that within the bounds of Christian freedom we are allowed to decide how many children we would like to have.
God opens the womb - God is absolutely sovereign. He has foreordained every pregnancy that has ever happened and that will ever happen. Whether a woman has one children or fifteen, God has decreed the beginning and end of each pregnancy.
Now I dont agree with everything he says here but I do agree with some things.
Just a few thoughts..... :D