S.M.
First off thanks for asking this. I'm in exactly the same position. 2 yr old waking often at night and due in less than 2 weeks with #2.
My mom's suggestion was this: My daughter is really prone to night terrors and nightmares and the combination of her teething, and her ability to sense a HUGE change (new baby) but doesn't really understand it makes sleep a lot more difficult. Her suggestion was going in and calming her once and after that put her in my room on the floor next to my bed to sleep so she know's I'm there but is still in her own space. It seems to be helping and I'm getting what little sleep I can! Good Luck! Oh and according to my mom once this new baby is here a few days after that things should go back to normal!