In the early stages of pregnancy, when the fertilized egg may have just been laid, the embryo is not particularly stable and the placenta has not yet grown, so it is best not to take a bumpy ride in a car. The bumpy ride can have a negative impact on the body, causing significant strain, and may also cause abdominal pain and vaginal bleeding, which can lead to preterm abortion. In cases where the growth of the embryo is not particularly stable, spontaneous miscarriage may also occur, so it is forbidden to take a bumpy ride in the first trimester of pregnancy, as well as to have intercourse and strenuous exercise, in order to avoid accidents. Although occasional bumps in the car may not cause accidents 100% of the time, there may be no way to save them once they occur, especially for women who bleed a lot after a bump in the car. Therefore, in order to avoid accidents, try not to take a bumpy ride.