WBWP/Extreme case precociously pubescent parent

So, you somehow got some girl pregnant before you were even out of diapers. That's quite interesting. Well, let's cover the juicy stuff first because this is where the backstory can be better than the story itself. So then, 1st question. Who did you impregnate?

• My mother
• My teen sister
• My precociously pubescent older sister
• My babysitter
• A relative stranger