Okay okay, well for one. The inteenimater hack/mod/ whatever, messes up your game. it makes errors out of everything, and it's very hard to get your sims to do anything.
For two, Getting a teen sim pregnant is a risky thing. Unlike adult sims, teen sims will starve themselves, exhaust themselves, and get their mood down to the red they die. Teen sims also cannot go to school when they're pregnant, so their grades drop rapidly and they eventually end up dropping out.
For three, That is kinda gross. I tried it out because someone kept saying it was Valid, but I thought it'd be bogus. Yes, you can get your sim pregnant, but you can't make them woohoo. You have to use this.. pink clock thing. Even when you're about to give the birth, it'll cut if off in the middle of the scene and say "Error".
I wouldn't recommed getting your teen sim pregnant. What i do for machinnima, is I use stretch skeleton to make them the heigth of a teenager, and still get thim pregnant. IT makes them look like a teen, when it's really a short adult.
Yea. Anyway, take my advice. If you choose to ignore it, say goodbye to your work. It messed up my game so bad, I had to uninstall it from my computer. I tried to save my progress, but it still was messing up. Anywho, it's up to you.