Is ultrasound accurate for four months of pregnancy? What should I check for in the six weeks of pregnancy?

After pregnancy, you need to have regular prenatal checkups to check the development of the fetus. If the fetus is relatively large, the pregnant mother can also see the baby's appearance through B-ultrasound and other examinations. B-ultrasound examination can also check the weight of the fetus, the position of the placenta, etc. So is it accurate to check B-ultrasound in the fourth month of pregnancy?

Is ultrasound accurate when you are four months pregnant?

During pregnancy, doctors will use B-ultrasound to detect the development of the fetus' organs to determine whether the fetus is developing properly. Due to different measurement methods and angles, there may be some errors, but this is normal, and in medicine, an error of up or down two weeks is allowed.

The fourth month of pregnancy is the second trimester. Ultrasound examination at this time can measure the biparietal diameter, femoral length, abdominal circumference, etc. of the fetus, which can be used to calculate the weight of the fetus. However, the fetal weight calculated by ultrasound has a deviation of ±10-15% from the actual weight of the fetus.

In addition, the amount of amniotic fluid is similar to the size of the fetus, but because they are both measured through B-ultrasound examination, there will be a certain deviation.

In addition to the size of various parts of the fetus, B-ultrasound can also show the position of the placenta, whether it is the anterior wall or the posterior wall. If the placenta is anterior, you need to pay more attention to rest and move gently to prevent miscarriage/premature birth.

Finally, I think the main purpose of the questioner should be the gender of the fetus. Although the reproductive organs of the fetus have developed at this time and the gender can be judged by the reproductive organs, the B-ultrasound examination at 4 months of pregnancy is not particularly obvious, and the posture and position of the fetus will affect the results, so the accuracy rate is not 100%.

What to check at 6 weeks of pregnancy

The first prenatal checkup in the true sense is usually at 12 weeks of pregnancy, but many pregnant women usually have their first prenatal checkup at 6 weeks of pregnancy:

Complete blood test

The first prenatal blood test is mainly to detect whether the HCG level in the pregnant mother's body has doubled, so as to preliminarily judge the development of the fetus; it can also detect the pregnant mother's blood type, whether she is anemic, etc.

Urinalysis

Urinalysis is mainly used to determine whether the pregnant mother has diabetes or poor glucose tolerance, and whether she has problems with protein metabolism.

B-ultrasound or transvaginal ultrasound

The first prenatal checkup with B-ultrasound has two purposes: one is to confirm pregnancy and exclude the possibility of ectopic pregnancy; the other is to detect the development of the fetus and whether the embryo and fetal heart rate are developing normally. Generally, vaginal ultrasound in early pregnancy is more accurate than B-ultrasound, and it does not require pregnant mothers to hold their urine.

Height, weight

After understanding the pregnant mother's height and weight in the early stages of pregnancy, the doctor will calculate the pregnant mother's weight gain data during pregnancy based on the formula, allowing the pregnant mother to gain weight scientifically.

blood pressure

Test the pregnant mother's blood pressure to determine whether she suffers from high blood pressure or the chance of developing gestational hypertension.

In order to ensure the accuracy of the test results, pregnant mothers must remember to collect "midstream urine" for testing. Do not collect it right after urination, and do not collect the last urine.

Fetal development standard for four months of pregnancy

The body length is about 16cm; the weight is about 110g; the average biparietal diameter is 3.62±0.58cm; the average abdominal circumference is 10.32±1.92cm, and the femur length is about 2.10±0.51cm.

The fetus's face has already taken on a human outline and shape, and under the B-ultrasound, it looks more like a little doll. Eyebrows and hair have also grown, but the amount is very sparse, so pregnant mothers don't need to worry, because they will develop again when they are seven months old.

Starting from this month, pregnant mothers will feel slight fetal movements, like a fish blowing bubbles or a butterfly flapping its wings.