Timing of prenatal care Prenatal care is a medical examination that pregnant women receive during pregnancy to protect the health of the mother and fetus. Specific requirements may vary slightly in each region, but pregnancy screening is usually required at 10-12 weeks of pregnancy. Pregnancy screening uses blood and ultrasound tests to determine if a pregnant woman has certain genetic diseases and abnormalities. As pregnancy continues, pregnant women need to attend frequent prenatal checkups. Precautions for pregnancy check-ups Generally, pregnant women need to have a monthly check-up during the first three months of pregnancy. After 4 months of pregnancy, the frequency of checkups will increase to once every two weeks. pregnant