The weeks of pregnancy with fetal heart is based on each person’s menstrual cycle, the time of ovulation, and the way the test is performed. If you normally have a regular menstrual period, such as one period in 30 days, you can usually see the fetal heart by ultrasound around 6 to 8 weeks of pregnancy. The entire menstrual cycle of a woman’s pregnancy, which lasts about 280 days, is usually counted from the first day of the last menstrual period. If you normally have regular periods, for example, every 28~30 days, and each period clears in about 3~7 days. About 6~8 weeks after menopause, the fetal heartbeat can be seen by abdominal ultrasound. Ultrasound modalities include abdominal ultrasound and vaginal color ultrasound. Vaginal color ultrasound has a higher resolution and can see the fetal heart a little earlier than abdominal ultrasound. In some women, the fetal heart can be seen by vaginal ultrasound after 5 weeks of menopause. To sum up, the time to see the fetal heart is different for each person. If the examination is earlier and the fetal heartbeat is not yet seen, the ultrasound can be repeated again after one week of menopause until the fetal heartbeat is seen.