im pretty sure its fine to drive right up until you feel confortable enough, as the others said, as long as you can sit and reach pedals and wheel ok.

Im more scared to drive a heap when im bigger, as im always worried what 'Might' happen. And im a little worried bout the pressure of the retractable seat belt sitting on my bump.

however i saw a show on foxtel home and health show which says its fine to have the seatbelt across your tummy, just use aa small pillow or towel wrapped around the belt.