The best time to take iron supplements during pregnancy is up to two hours after a meal, and they need to be taken immediately after an iron deficiency is detected during pregnancy. This is because iron supplements can be slightly irritating to the gastrointestinal tract, and those taken two hours after a meal will reduce this irritation. In addition, you need to supplement immediately when you notice symptoms of anemia. The earlier the supplementation, the easier it will be to correct the iron deficiency anemia as soon as possible and avoid the effects of anemia on the health of the pregnant woman and the development of the fetus. If a pregnant woman is not iron deficient, and her hemoglobin and red blood cells are within the normal range through laboratory tests, then it means that she does not have iron deficiency anemia, and therefore does not need to supplement. If the test reveals iron deficiency anemia, then it is necessary to supplement as soon as possible after the test. If the anemia is more serious, you can take medication, the more common drugs are ferrous succinate tablets, ferrous sulfate tablets, all need to follow the doctor’s instructions.