Question: how much weight should you gain by week 7?
Answer: If your BMI is in the underweight category, you should gain 28-40 lb (12.5-18 kg). If you're overweight, your pregnancy weight gain should be 15-25 lb (7-11 kg). Women in the obese category should gain at least 15 lb (7 kg). Women carrying twins should plan to gain about 35-45 lb (16-20 kg).