The absence of fetal heart at 7 weeks of pregnancy may or may not be normal, e.g. abnormal embryonic development can lead to absence of fetal heart at 7 weeks of pregnancy.
The fetal bud is one of the earliest tangible structures of the embryo, and as the bud develops, the fetal cardiovascular beat, known as the fetal heart, will gradually appear. The earliest fetal heart seen is not necessarily the beating of the heart itself, but may also be the beating of blood vessels. The fetal heart and buds usually appear around 6 weeks of pregnancy.
The absence of a fetal heart at 7 weeks of pregnancy may be normal. A fertilized egg can be formed after intercourse during ovulation, and the fertilized egg will settle in the uterine cavity after 7 to 8 days and then begin to develop. An abdominal ultrasound at 6 weeks of pregnancy can show a gestational sac in the uterine cavity, and there is a fetal heartbeat and buds in the sac at about 7 weeks of pregnancy. Irregular menstrual periods or late conception may result in a later onset of the fetal heartbeat.
The absence of fetal heart at 7 weeks of pregnancy may also be abnormal and caused by abnormal embryonic development, such as chromosomal abnormalities that may cause the embryo to be underdeveloped and unable to form a fetal heart and buds. The presence of certain diseases, such as diabetes and embolism, can also affect the development of the embryo.
If there is no fetal heartbeat for a long time, it is recommended to go to the hospital in time, and conduct relevant examinations for different individuals, so as to avoid delaying the condition or triggering adverse reactions.