47-day gestational sac size comparison table

After pregnancy, a gestational sac will be formed first, which is also the predecessor of the fetus. During pregnancy, the pregnant woman's body will experience various early pregnancy reactions, and all aspects of the body are still in an unstable state. At this time, regular pregnancy check-ups are necessary. While checking the pregnant woman's body, the condition of the gestational sac should also be checked. Let’s take a look at the 47-day gestational sac size comparison chart.

At 47 days of pregnancy, the normal values ​​are: the fetus grows to 0.4 cm, enters the embryonic period, the amniotic cavity expands, primitive cardiovascular system appears, and may have pulsation. A small gestational sac can be seen on B-ultrasound, which occupies less than 1/4 of the uterine cavity, or a fetal bud can be seen.

Gestational age and gestational sac size comparison table

1. The gestational sac is only seen in early pregnancy. For women who have regular menstruation of 28 to 30 days, after 35 days of amenorrhea, the gestational sac can be seen in the uterine cavity by B-ultrasound. The diameter of the gestational sac is about 2 cm at 6 weeks of pregnancy and about 5 cm at 10 weeks of pregnancy. It is normal for the gestational sac to be located at the fundus, front wall, back wall, upper part, or middle part of the uterus. It is normal for the gestational sac to be round, oval, and clear. If the gestational sac is irregular, blurred, and located in the lower part, and the pregnant woman also has abdominal pain or vaginal bleeding, she may have a miscarriage.

2. Use the gestational sac to calculate (length + width + height) / 3 + 25, the unit is mm, and the result is the number of days. The embryonic bud is the length of the embryonic bud + 6.5, the unit is cm, which is the number of weeks. On the other hand, at 4 weeks, the gestational sac is very small and ultrasound cannot clearly show signs of pregnancy. At 5 weeks, a small gestational sac can be seen on B-ultrasound, which occupies less than 1/4 of the uterine cavity, or a fetal bud can be seen. At 6 weeks, the gestational sac was clearly visible on B-ultrasound, and the embryo and fetal heartbeat were also seen. At 7 weeks, B-ultrasound can clearly show the embryo and fetal heartbeat, and the gestational sac occupies about 1/3 of the uterine cavity. At 8 weeks, B-ultrasound can show that the gestational sac occupies about 1/2 of the uterine cavity, the fetal shape and fetal movement are clearly visible, and the yolk sac can be seen. At 9 weeks, B-ultrasound showed that the gestational sac almost filled the uterine cavity, the fetal outline was clearer, and the placenta began to appear. At 10 weeks, B-ultrasound shows that the gestational sac begins to disappear, a crescent-shaped placenta is visible, and the fetus is active in the amniotic fluid. At 11 weeks, B-ultrasound showed that the gestational sac had completely disappeared and the placenta was clearly visible.

3. A gestational sac of 34*54*29 in size indicates about two months of pregnancy. Usually, in order to facilitate the calculation of the gestational age of pregnant women, obstetricians and gynecologists will count four weeks as one month, which means that you may be seven or eight weeks pregnant, but this is just an estimate. Method for calculating the weeks of pregnancy: In medicine, the first day of the last menstrual period before pregnancy is usually used as the first day to start counting the weeks of pregnancy. If the first day of your last menstrual period was August 20, then you are currently eight weeks and one day pregnant, which means you are currently on the second day of the ninth week. You can calculate how many weeks it has been this way.