The ability to detect a fetal heartbeat in early pregnancy is a key factor in determining whether the pregnancy can continue, and generally requires more than 5 weeks of pregnancy. If the menstrual cycle is regular, on average once a month, then the fetal heart can be detected through vaginal ultrasound about 35 days after menopause; if the menstrual cycle is irregular, the fetal heart can be monitored under vaginal ultrasound after ovulation, that is, about three weeks from the time of intercourse, if the development of the gestational sac is late, the time may be, appropriately, extended The time may be extended by one week. After having intercourse during ovulation, the chorionic gonadotropin, or hcg, in the blood will be elevated 7 to 8 days after intercourse, and early pregnancy will be highly suspected, and the urine hcg will be positive around 12 days after intercourse, and the complete gestational sac and fetal heartbeat can be seen under vaginal ultrasound around 15 days after intercourse, or 5 weeks after menopause. The gestational sac and fetal heartbeat fluctuate, and most women will also experience symptoms of the digestive tract such as nausea and vomiting. Therefore, when a woman is diagnosed with pregnancy, she can go to the hospital for a blood test for hcg and ultrasound to confirm the presence of fetal heartbeat after more than 1 week of menopause, which is about 5 weeks of pregnancy or more.