Please, Please, Please, do NOT take fat burner pills while you are pregnant (you shouldn't even when not pregnant). These pills contain stimulants that increase your heart rate and blood pressure and anything that has an effect on you, also affects the baby. I know how hard it can be to accept the weight gain while pregnant. I am someone who has NEVER weighed more than 110 pounds in my life and now I am at 116 pounds at 19 weeks and I know there is more to come. I look at my butt in the mirror and can just cry but I know that the weight gain is for a good cause and that with a little hard work after the baby is born, I will lose it and get my figure back. The female body is designed to put on body fat during pregnancy and you don't want to do anything to negate that for the health of your baby. If you are taking them already, please stop right away and also tell your doctor so they know.