Whether or not to take calcium tablets during pregnancy preparation also depends on the actual physical condition of the woman preparing for pregnancy. If a pregnant woman is healthy and in good nutritional condition, and her pre-pregnancy checkup shows that her body indicators are normal and she does not have calcium deficiency symptoms such as calf cramps and joint pains, she does not need to take calcium tablets and can start taking calcium supplements after 20 weeks of pregnancy. On the contrary, if a woman preparing for pregnancy has a calcium deficiency in her body, then she can take supplements in moderation under the guidance of her doctor. In addition to taking calcium tablets for calcium supplementation, it is more recommended to maintain the daily calcium requirement through daily diet and activities during pregnancy preparation, such as consuming more fish, shrimp, eggs, milk, soy products, etc., as well as vegetables and fruits to maintain a balanced nutrition, and also to promote calcium absorption by getting more sunlight, which can basically meet the calcium requirement in our body. Calcium supplementation is not good, a large intake of calcium will affect the absorption of other trace elements, such as iron and zinc. Therefore, avoid taking iron and zinc supplements at the same time while taking calcium supplements, so that calcium tablets will not affect the absorption of iron and zinc.