This friend can only hear the initial fetal heart rate of 8 weeks. A few people may be able to see the gender, but the gender characteristics of men and women are not very obvious at this time.

The study of fetal sex detection by ultrasound in the first trimester is mature.

But it generally refers to the sex identification of the fetus before 14 weeks. This accuracy rate is over 90%. It's best to find a special doctor for examination.

My doctor detected accurate results in 12 weeks.

The basis of detection is mainly to look at the circular arch or three parallel lines according to the breech position.

It has little to do with pregnancy.

If you are interested, I can send you some papers (English version).

16- 18 weeks later,

At this time, the result is basically not wrong. Ultrasound can only be used as a judgment,

But to make a definite diagnosis, it is still necessary to do invasive examination and check chromosomes.