In the early stages of pregnancy, the embryo development is not stable, if riding an electric bicycle at this time the bumps are more violent, it may lead to preterm miscarriage. Early pregnancy is a critical period of embryonic development, and embryonic development is not stable. If a pregnant woman rides a motorized bicycle in the early stages of pregnancy, it may lead to preterm miscarriage. Pregnant women may experience symptoms such as vaginal bleeding and lower abdominal pain. Pregnant women should try to avoid strenuous exercise in early pregnancy. When riding a motorized bicycle, you should try to choose a road with good conditions to avoid violent bumps that may cause preterm miscarriage. At the same time, you should also pay attention to rest and eat more nutritious food to promote the growth and development of the fetus. If a pregnant woman experiences a small amount of vaginal bleeding or lower abdominal pain after a bumpy ride on a motorized bicycle in the early stages of pregnancy, she should go to the hospital and receive targeted treatment under the guidance of her doctor.