Oh boy, I feel for you. I am pregnant with my 4th child. With each baby I gained 50-54 lbs (my pre pregnancy weight has always been between 102-108 lbs). I am 25 weeks (and I've already gained 30 lbs). I truly believe that every woman is different. From what you've described and from my own experience with weight gain, you and I are the unfortunate ones who are (1) hungry all the time (is this true for you??), and (2) every morsel we eat sticks to our bones. I have been told by sympathetic listeners that this weight gain is actually good (for who??) because it means we are nourishing our babies. Hmmm...all of my babies were around 7 lbs (all born by c-sections, as my current pregnancy will be a scheduled c-section)...so all this weight I've gained will have to wait to come off until I my doctor's approval and even then, I have to gradually ease myself into working out. BTW, before pregnancy, I am very active and fit (not bragging here) so for me the weight comes off and with each baby, I've gotten to my pre-pregnancy weight in 6 months or less. I DO believe that breastfeeding does contribute to the weight loss as well...the baby sucks all that fat right outta' me! : ) I never dieted after having a baby. I don't believe in them, and I don't believe in depriving oneself of the things they enjoy eating. Just eat less, which for me, after I have a baby, my appetite goes back to normal. Thank goodness for that!
I understand you are only a month pregnant and you feel "full" already. This fullness cannot possibly be a lot of weight gain. You need to consider the volume of blood that increases, and other fluids,, the size of your uterus, as the baby grows then you have the size/weight of the baby...so it's not ALL weight gain in terms of fat on your body, although, I know, you do feel that way. I feel that way too! It all gets distributed in various places and once you have the baby, you should lose approximately 10 lbs. That's nice, isn't it? Yes, you will have to work the rest off but if you've done it before, like I have 3 times already, we can do it again.