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You can also work out your BMI using our calculator. There are no official UK guidelines for how much weight you should gain over your pregnancy. There is only general advice that most women put on somewhere between 10kg and 12.5kg (22lb to 28lb) (NHS 2011). You'll gain most of the weight after 20 weeks (NHS 2011). See below for average weight gain (IOM 2009):
First trimester weight gain should total right around three to five pounds. Your weight gain during the first trimester will probably be barely noticeable. Often, first trimester weight gain is most noticeable in the size of the breasts. Weight gain during the second and third trimesters of pregnancy is going to be more steady after the first trimester. During the second trimester of pregnancy, you will gain around 1 to 2 pounds per week.