Pregnant women start to show pregnancy around the fourth month of pregnancy, but the time varies from person to person because of the differences in their body constitution. Most women may experience back pain or a feeling of heaviness in the body, as well as a feeling of swelling in the abdomen or symptoms of urinary urgency and frequency after the onset of pregnancy. During pregnancy, you should pay special attention to your body changes and monitor the fetal movement. If the fetal movement is too slow or too fast, it is very unfavorable to the healthy development of the fetus. It is necessary to go to the hospital for a timely checkup to determine if there is a lack of oxygen, and to maintain a nutritious diet. The pregnant woman starts to show her pregnancy around the fourth to fifth month of pregnancy, during this period you can take appropriate calcium tablets to avoid calcium deficiency.