I've been lurking a bit and decided to throw my two cents worth into the debate. There is mention of sick people seeking physicians, and no where is there any indication that this is wrong. For the typical couple, their fertility is not a health problem. Life and health are a blessing. Nowhere does Scripture tell us we are not to seek after blessings.
Fertility is a blessing.
Barrenness is a curse, at least according to Scripture. However, childbirth is well known to be one of the most life threatening activities a woman can undergo . Well, I guess I like living dangerously. Seriously, I would like to know the basis for that statement. You see, we don't use birth control, so we have a countless number.