No teenager on Sims can be PREGNANT. unless you have a cheat, but they cant!
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You get the parent or the child if they are a teenager or you get the students to walk to school, which you can only do (I think) if you have the Apartment Life expansion pack for the normal Sims 2 game, not the stories one.
you can you download inteenimator it will work
no, only young adults +
In sims life stories there is no cheat for teen pregnancy.
You cant, however you can on Sims Castaway life stories, when 2 sims of opposite gender are lying in bed, (given your reputation is high enough) select "Make a baby".