Fetal heart and buds are determined by blood values, which can be reviewed dynamically under a doctor’s supervision. After pregnancy is detected by blood or urine HCG (human chorionic gonadotropin) levels during early pregnancy, an ultrasound examination is usually performed at about 6 weeks after menopause to clarify intrauterine pregnancy, and to see if there are fetal buds and a fetal heart. When the fetal heart is not detected by ultrasound, the week of pregnancy should be checked with the menstrual cycle, blood HCG level and the size of the gestational sac, and the pregnancy should be rechecked on time as prescribed by the doctor. Generally, when the menstrual cycle is long, due to the time of ovulation and the time of fertilization will be delayed, ultrasound examination of the appearance of fetal buds and fetal heart will be delayed, according to the HCG, progesterone and the size of the gestational sac to check the gestational week, you can follow the doctor’s instructions for 7 to 10 days for re-examination in order to learn about the development of the embryo, if necessary, need to be given by the doctor to preservation of the fetus, such as progesterone and other medications treatment.