Yes it would, because if you don't start until you are 30, you've "lost" a decade of childbearing. That's a pretty serious reduction in the maximum number of children you are likely to produce.
How many do you want? 2 is quite normal, are you saying you'd only be able to have 3 maximum (but 2 in reality) instead of 12 maximum (but 2 in reality) or what?
