At 40 days of pregnancy, the fetal heart and buds may be seen if intercourse occurs relatively early, and may not be seen if intercourse occurs later. At 40 days of pregnancy, if the time of intercourse is relatively early, the fertilized egg develops faster in the uterine cavity, and the development of fetal heart and buds may be seen in the uterine cavity. If you have intercourse later, the fertilized egg grows and develops slowly in the uterine cavity, you may not be able to see the development of the fetal heart and buds in the uterine cavity, and you can check the ultrasound again in a week. Since the time of conception is different for each woman, the time of development of the fetal heart and the fetal buds will also vary slightly. If you don’t see any fetal heartbeat or buds for the time being, don’t be too anxious, and check the ultrasound again in a week or check the doubling of blood HCG before making a comprehensive judgment.