Strenuous exercise during the first month of pregnancy can lead to miscarriage. In the first trimester, the fetus is not very stable and is easily disturbed by the external environment. Strenuous exercise, sexual intercourse or emotional instability in the early trimester may lead to miscarriage. Therefore, it is generally recommended that during the first trimester of pregnancy, it is important to pay proper attention to rest, not to do strenuous exercise, and not to carry heavy things. If you experience stomach pain and bleeding after strenuous exercise, go to the hospital for an ultrasound in time. If the fetus is developing normally, it is necessary to keep the fetus intact. If there is no significant discomfort for the time being, it is recommended to take a good rest and refrain from strenuous exercise throughout the subsequent stages of pregnancy.