I think some things need to be separated.
First, marriage should not be mandatory and nor should having children. That should be a choice and yours or the couple's alone, not the parents' and relatives'.
Secondly, family planning should refer to how many children you want. I know many religious people think the more the merrier as they say children are gift of God, but raising those children right, giving them what they need (proper education included) is your responsibility and if you can't guarantee that, then why make children suffer?
I'm not going to be popular with my opinion, but this is how I see it. It's the 21st century.