Q: How much weight gain should I expect?
A: It depends.
Gaining weight is part of pregnancy and not all women are the same. Depending on how much you previously weighed, in comparison with your height, will equal the amount you need to gain. The relationship between your weight and height is called your “body mass index” or BMI. Calculate your BMI here.
For instance, average women need to gain between 25 to 35 pounds (a BMI of 18.5 to 24.9) while underweight women should gain 28 to 40 pounds (a BMI below 18.5) . Overweight women, on the other hand, only need to gain 15 to 25 pounds (a BMI of 25 to 29.9) during pregnancy. Obese women also need to gain little weight-11 to 20 pounds (a BMI of 30 or higher). This can be accomplished by increasing your calorie intake by 100 to 300 more calories per day. Also you should talk to your doctor about how much weight you should be gaining during pregnancy.
One question I personally had is where does all the weight go? WebMD tells us that the weight is distributed into these specific areas:
Baby: 8 pounds
Placenta: 2-3 pounds
Amniotic fluid: 2-3 pounds
Breast tissue: 2-3 pounds
Blood supply: 4 pounds
Fat stores for delivery/breastfeeding: 5-9 pounds
Uterus increase: 2-5 pounds
Total: 25-35 pounds
Moral of the story: every pound you gain is needed, so enjoy eating a few more calories!
Preparing for a Healthier Pregnancy 
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