honestly, i'd wait until after the baby comes and your daughter has time to adjust. most of the time, potty trained kids tend to regress after the birth of a new sibling anyway. with my first, i waited until i was done nursing the second (at 4 months) and then started potty training (so my first was almost 2 1/2) and she got it right away. with my second, i waited until my 3rd was 6 months, maybe(?) and my second was just over 3 years old, and she was a bit slower, but partly because i was less consistant with her.... but she didn't take too long.
anyway, i'd make a point of going potty right before bathtime for now, and of course, any time she asks to go, but other than that, i'd wait until after the baby comes.
congrats, by the way! boy or girl???