NO!!!!  That is TOO MUCH!  Check out WHO guidelines.  First trimester is ZERO additional calories for a healthy-weight woman.  International Institute of Medicine says 340 in 2nd trimester and 450 in third, but that's for healthy-weight women, and that's the high end to insure no underweight babies at all.  For someone obese, the numbers are 0, 200, and 300. A lot of pregnancy weight gain is water:  blood volume and amniotic fluid.  Baby weight, placenta, and fat stores are only about two-thirds or so.  So women don't need 3500 cal for every pound they're supposed to gain.  Plus, a lot of the baby is organ/muscle/bone, which requires less energy per pound, too.  Making a big baby takes like 60k calories.  That's it.