Lipo on stomach and thighs now pregnant, will I gain my weight back?

Congratulations on your pregnancy! It is normal and healthy to gain some weight as your child develops during pregnancy. Liposuction changes the fat distribution on your body permanently, so as you gain weight, it will probably be distributed first to areas that hadn't been treated. However, if you gain an excessive amount of weight, the fat cells that remained in the liposuctioned areas may swell to accommodate the extra volume. Once you lose weight again, they should return to their normal size. The best bet, though, is to monitor your weight carefully with your obstetrician to be sure you are gaining only what is needed for your baby's health. After you have given birth, if you are unhappy with the way your figure looks, you can consult a board-certified dermatologist to see if you would benefit from a noninvasive fat-elimination technique such as CoolSculpting or perhaps just a skin-tightening treatment such as ThermiTight.

Great question!  This question goes to the heart of what liposuction actually is.  Liposuction is a process of suctioning out not only fat, but also the cells that store the fat.  Therefore, a well done liposuction decreases the number of fat cells in any given area.  Since the number of fat cells present determines the amount of fat one area can store, ergo there will be less total amount of fat stored in any post liposuctioned area.  An analogy would be, if you had a gym with 100 lockers and you took out 75 of them, the number of sneakers that could be placed in that gym has decreased by 75%.

As long as you return to your pre-pregnancy weight after having your baby none of the fat will return.  If you still have persistent weight gain after your pregnancy this will be obvious all over and in area you did not have treated with liposuction in particular.  Hopefully this was helpful.