How many days after pregnancy can a B-ultrasound detect the pregnancy?

Pregnancy can generally be detected through B-ultrasound examination during pregnancy. As there are many methods to detect pregnancy clinically, and the accuracy of B-ultrasound examination is very high, the time of B-ultrasound examination is also related to women's menstrual cycle. Generally, pregnancy can be diagnosed through B-ultrasound examination about 35 days after menopause, and it may also be detected several days earlier.

The time of B-ultrasound examination is related to the menstrual cycle. It can be specifically determined based on women's menstrual conditions, including implantation and ovulation. If the menstrual cycle is around 21 to 28 days, a B-ultrasound examination can be performed at the hospital about 35 days after menopause. At this time, the gestational sac can be seen, as the ovulation period will advance with the early menstruation, and implantation will also occur earlier.

Some women can be examined around 42 days. Although these women have a very regular menstrual cycle, which is once every 30 days, they can go to the hospital for a B-ultrasound examination around 42 days from the first day of the last menstrual period. The gestational sac can be seen. If there are abdominal pain, vaginal bleeding, etc., during the observation period, they should go to the hospital for screening at any time to exclude the possibility of ectopic pregnancy.

If pregnancy lasts for more than five weeks, a transvaginal ultrasound examination can be performed. Pregnancy can be detected through abdominal B-ultrasound examination around six weeks. Transvaginal ultrasound is relatively earlier and has higher clarity. If menstruation has stopped for six weeks, both transvaginal ultrasound and abdominal B-ultrasound are acceptable. However, for abdominal B-ultrasound, it is necessary to hold urine before the examination. If the gestational sac and yolk sac are seen in the uterine cavity, it can be diagnosed as pregnancy.