Remember as with any weight loss and exercise program, moderation is the key! How fast you lose weight will depend on a number of factors, including the amount of weight you gained during your pregnancy.Most women will lose anywhere from 10-14 pounds within the first 2 weeks of delivery. This weight may be attributed primarily to the loss of excess fluid in the body, the baby’s weight, the placenta and amniotic fluid. Some women might lose a little bit less, and others might lose a little bit mo.