If the menstrual cycle is usually regular, the fetal bud can be seen by ultrasound examination, usually around 6 weeks (42 days) of pregnancy, and the primitive cardiovascular pulsation can be seen around 7 weeks (49 days) of pregnancy. If the fetal bud and fetal heart are not seen in 50 days of pregnancy, it can be due to delayed ovulation caused by irregular menstruation or embryonic abortion, ectopic pregnancy, etc. 1. delayed ovulation: irregular menstruation can lead to delayed ovulation, which leads to late implantation, and the actual gestational week may be less than 50 days, at which time the fetal heart and fetal bud cannot be seen on ultrasound, so it is recommended to wait 10 days before going to the hospital for re-examination; 2. fetal abortion: embryonic abortion caused by malnutrition or chromosomal abnormalities, etc. 2, fetal abortion: the embryo is not developing well due to malnutrition or chromosomal abnormalities, resulting in the absence of fetal bud and fetal heart on the 50th day of pregnancy. If the embryo is diagnosed to be underdeveloped, abortion is recommended in time. In addition, in the case of ectopic pregnancy, the fetal bud and fetal heart cannot be found in the uterus. In order to avoid these situations, it is recommended to have regular maternity checkups so that pregnancy complications or comorbidities can be prevented early and fetal abnormalities can be detected in time to ensure the safety of mother and child. Also pay attention to avoid exposure to toxic and harmful substances in the early stages of pregnancy, and also continue to apply folic acid tablets. Avoid chest X-ray, CT and other examinations that are radioactive to the body, and use drugs with caution.
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