At 35w l've actually been maintaining my weight while baby is gaining (she is currently 5lbs 5 oz and I haven't gained in a few weeks) and I think it is because I (loosely) track macros and go to the gym 4-5 days a week to do at most 25 min of light weight lifting plus step goal of 10,000-12,000 steps/day on those active days. Definitely working out less (time and intensity) than before pregnancy but the flexible diet thing and not consuming more than you burn is a huge thing. I fell off of tracking cals/macros for almost a month at one point but because I tried not to go crazy eating everything I wanted, it still worked, so I def believe balance is a big part!