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This is very important to understand. As pregnancy advances, particularly from after 28 weeks, placental activity increases to keep the baby in good health. To do this placenta produces some hormones which act against Insulin and your dose of Insulin goes up and up during pregnancy, sometimes on daily basis we need to increase Insulin dose. So, increment of Insulin dose in pregnancy is normal, if the dose does not go up, we get worried whether the placenta is working normally or not.