For the people who the pregnancy isn't working for,if you have the Sims 3 for the DS or DSI then that is the problem. It is rated E for everyone so no it can't have a baby or Woohoo. So if you want a baby you need to get Sims on the PC, Wii, or 3Ds. If its not letting you and you don't have a DS or DSI, Then I honestly have no idea.
Agent REd *Insert star wars theme*