B-ultrasound picture of a gestational sac twins

The gestational sac is the initial shape of a pregnant mother, and the size of the gestational sac will change due to different pregnancy cycles. Can one fetal sac lead to twins? Generally speaking, one gestational sac creates one life, but in clinical practice there are cases of identical twins, so it is possible that there are two babies in one gestational sac. The editor will give you a detailed introduction below.

Can a fetal sac carry twins?

The fetal sac is the initial form during pregnancy. Its formation marks the beginning of the embryonic development process, indicating that a new life has begun to be created.

1. The gestational sac is the initial shape of pregnancy. It is a small test tube embryo in which the initial embryonic tissue is encapsulated by the amniotic membrane and vascular network. The baby had not yet been born at that time, but the fetal heartbeat had already begun when the embryo bud and fetal heartbeat appeared.

2. The gestational sac is very small at first, and then gradually grows bigger. Under normal circumstances, after 5 weeks of pregnancy, a small gestational sac can be seen on B-ultrasound, which occupies less than 1/4 of the uterine cavity, or the fetal bud and fetal heartbeat can be seen from it. If it is a normal intrauterine pregnancy, the gestational sac can be seen in the uterus through B-ultrasound around 40 days of pregnancy. However, due to individual differences and the early or late pregnancy time, some pregnant women may not be able to see it until around 45 days.

3. Generally, when HCG reaches 1000U/L, vaginal ultrasound should be able to identify the intrauterine gestational sac. This time is around the 4th or 5th day of the 5th week of pregnancy. When HCG reaches 6500U/L, abdominal ultrasound can identify the intrauterine gestational sac. Therefore, vaginal ultrasound will be more accurate. If the normal menstrual cycle is reached and the intrauterine gestational sac is not seen on the 49th day of pregnancy, ectopic pregnancy should be suspected.

So, can one gestational sac conceive twins? In clinical medicine, there are monozygotic twins, which means one gestational sac, and dizygotic twins, which means two gestational sacs. If two gestational sacs are found during B-ultrasound in early pregnancy and both have fetal buds and primitive heart tube beating, they are twins. There is a situation in which one of the gestational sacs will gradually disappear during the development stage. In this case, it is still a single baby. There are also many cases of identical twins, which can only be detected when the babies are older. As long as you do prenatal check-ups on time, you will know whether they are twin babies later.

40 days of pregnancy

Generally, the fetal heartbeat and fetal bud can be seen in 40 days. When the gestational sac reaches about 1 cm, you should be able to see the fetal heartbeat. On the 40th day of pregnancy, a membrane forms inside the baby's nose, which is responsible for recognizing smells. Her eyes were still tightly closed, but tissue inside them had already begun to form.

Some mothers have not shown any early pregnancy symptoms on the 40th day of pregnancy, and it usually starts on the 42nd day. However, they should also pay attention to the balance of nutrition, take more folic acid tablets, and eat more light dishes.

Some pregnant women have obvious early pregnancy reactions, such as loss of appetite, vomiting, general fatigue, and gradual weight loss. It is hyperemesis gravidarum. Due to severe vomiting, a large amount of digestive enzymes are vomited out, and water cannot be consumed. The potassium intake of pregnant women is insufficient, which reduces blood potassium and causes hypokalemia, which is manifested as fatigue, listlessness, and drowsiness. In severe cases, it can even seriously endanger the life of the mother and the fetus. Hyperemesis gravidarum is related to mental factors, so you should learn to be strong and cheerful after pregnancy. Being a mother is a truly happy thing, but it is also very hard and requires the courage to take on everything. Regarding early pregnancy reactions, we must understand that it is just a physiological phenomenon and look at it with an optimistic attitude.

The symptoms of pregnancy forty days are mainly manifested in the interruption of menstruation, breast pain, unexplained nausea and retching, increased urination frequency, unusual body temperature during ovulation, easy fatigue in early pregnancy, frequent sleepiness, most women may experience dizziness, fatigue, always want to sleep, increased salivation, loss of appetite, nausea and retching after 6 weeks of pregnancy, and vomiting mostly occurs in the morning or on an empty stomach. These are all symptoms of early pregnancy.