Heh.
I have a son and a daughter (that's right, 2 out of 3 kids) who were both conceived while I was on the pill.
My sister has a child who was conceived while she was on the pill.
My other sister has a child who was conceived while SHE was on the pill and HE was using a condom.
I make sure to point out to my teenager that neither of her younger siblings would be here if it weren't for the failure of birth control. And neither would her younger nephews. It's enough - for now - to make her think sex is a crazy-stupid idea. (Thank the gods)
HOWEVER, legally speaking, you (or your friend, or whoever) isn't legally obligated to pay child support until a judge, or the state, tells you to.