This is weird but I did boxing and crunches and other type of
ab exercises all the way up until 7 months, it depends
on pre level of exercise but i didnt show for a VERY long time i was pretty toned, so I'd say squats back workouts ,YouTube has so many good workouts for pregnant women u can watch if u dont kno how to do them... And eating healthy , i only gained like 10bs ,in my pregnancy... but everyone is diff, the more your active the quicker you get back in shape..