The perfect trilogy in the first trimester, fetal sac (gestational sac), fetal bud, fetal heart rate (heart beat). These three are the proper nouns for B-ultrasound. These three steps appear in chronological order, that is, the gestational sac appears first in the uterus (to determine the intrauterine pregnancy), then the germ (to determine the gestational week), and finally the fetal heart appears. (Cue the baby to survive).

Fetal sac: also called gestational sac. It is the shape of the embryo at the beginning of pregnancy, and it is a small embryo wrapped in amniotic membrane and vascular network. Fetal sacs can generally only be seen in the first trimester. The position of the fetal sac on the fundus, anterior wall, posterior wall, upper and middle of the uterus is normal; the shape is round, oval, and clear as normal; if the fetal sac is irregular, fuzzy, and located in the lower part, pregnant women also When you have abdominal pain or vaginal bleeding, you may have a miscarriage.

Fetal bud: During the development of a fertilized egg, the first two weeks are called a pregnant egg. However, as time goes by, various organs gradually form. Before 8 weeks of gestation, they are called embryos (or fetal buds); from three weeks to four weeks in the first month of pregnancy, they are called fetal buds, and the fetal buds are 0.5-1 cm long like Little seahorse.

Fetal heart rate: It is the sound of the fetus's heart beating in the womb. The tone is clear and the rhythm is neat. You can understand the health of the fetus by listening to the fetal heart rate. Generally around 7 weeks of pregnancy, you can use B ultrasound equipment to see the fetal heartbeat; around 12 weeks of pregnancy, you can use doppler fetal monitor to detect the fetal heartbeat; 17-20 weeks, you can hear the fetal heartbeat with a general stethoscope on the abdomen Heart.