How big is the gestational sac during the second month of pregnancy

How big is the gestational sac during the second month of pregnancy

The gestational sac is generally an important indicator for examining the progress of a woman's pregnancy. Two months after a woman becomes pregnant, the size of the gestational sac should be about three to four centimeters in diameter. Of course, this is for women with normal menstruation. If a woman has menstrual problems, the gestational sac will generally develop more slowly after pregnancy. For example, the embryo may just grow two months into the pregnancy, but the gestational sac has not yet developed.

Pregnancy is a complex process. After the egg is fertilized, it enters the uterine cavity, and the embryo and its appendages grow and develop rapidly until they mature. There will be different changes in each week of pregnancy.

4 weeks: The fetus is only 0.2 cm. The amniotic cavity is formed just after the fertilized egg has implanted and its volume is very small. Ultrasound cannot show clear signs of pregnancy.

5 weeks: The fetus grows to 0.4 cm and enters the embryonic period. The amniotic cavity expands and primitive cardiovascular system appears, which may beat. B-ultrasound can show a small gestational sac, which occupies less than 1/4 of the uterine cavity, or a fetal bud can be seen.

6 weeks: The fetus grows to 0.85 cm. The head, brain alveoli, facial organs, respiratory, digestive, and nervous organs are differentiated. The fetal sac is clearly visible on B-ultrasound, and the fetal bud and fetal heartbeat are seen.

7 weeks: The fetus grows to 1.33 cm. The embryo has the rudiments of a human being. The body segments are fully differentiated, the limbs are separated, and various systems are further developed. B-ultrasound clearly shows the embryo and fetal heartbeat, and the gestational sac occupies about 1/3 of the uterine cavity.

8 weeks: The fetus grows to 1.66 cm. The fetal shape is determined, and the head, body and limbs can be distinguished. The head is larger than the trunk. B-ultrasound shows 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.

9 weeks: The fetus grows to 2.15 cm. The head is larger than the body, the various parts are clearer, the skull begins to calcify, and the placenta begins to develop. B-ultrasound shows that the gestational sac almost fills the uterine cavity, the fetal outline is clearer, and the placenta begins to appear.

10 weeks: The fetus grows to 2.83 cm, all fetal organs have been formed, and the rudiments of the placenta are formed. 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.

11 weeks: The fetus grows to 3.62 cm, the fetal organs develop further, and the placenta develops. B-ultrasound showed that the gestational sac had completely disappeared and the placenta was clearly visible.

<<:  Slow development of the gestational sac

>>:  Can a low gestational sac be preserved?

Recommend

Can pregnant women get injections when they have a cold?

Pregnant women cannot take medicine at will durin...

What to check for induction of labor

In daily life, most people do not pay attention t...

Ovulation and precautions after menstruation

The issue of how many days after menstruation ovu...

Infertility causes and treatments

Infertility refers to the inability of a couple t...

What causes vaginal itching in young girls?

Although young girls basically do not have sex li...

How to use female condoms

There are certain differences between female cond...

What to do if you have premature ovarian failure and amenorrhea? How to treat it

If a female friend experiences premature ovarian ...

Why do I have lower abdominal pain a few days before my period?

Abdominal pain before menstruation is a relativel...

Will the water stop flowing after it breaks?

To put it simply, rupture of water is the dischar...

What time of month is it easy to get pregnant?

When is the easiest time to get pregnant in a mon...

What are the targeted drugs for cervical cancer?

Cervical cancer is the most common gynecological ...

How long does it take to recover from a caesarean section?

The cesarean section method of delivery has gradu...

Is it a girl if her feet are swollen at 8 months of pregnancy?

The eighth month of pregnancy is the second half ...

What ointment to use for vulvitis

Due to the special physiological structure of the...