I don't, but my mom had my little brother when i was 13 and my sister was 18. He's starting high school in the fall! At the very least you have some great help on your hands (and incentive for your big kids to have safe sex or abstain!)
We have a 15 year old daughter, 12 year old son, and a 9 year old son. Everyone is very very excited to have a baby joining the family. I don't think I'll ever see this child except for when she's hungry or needs a diaper change..lol. They can't wait to see baby sister.
Re: Pregnant and have children in there late teens?