How long does pregnancy do B to exceed to be able to detect?

summary

I was supposed to have menstruation on January 1, but I didn't come to the 15th, so I went to see the doctor. The doctor prescribed drugs to promote menstruation and protect the fetus. After three days of prescribing, I found that I was pregnant with test paper, but I went to the hospital to do B-ultrasound, but I couldn't find out. So, how long does pregnancy do B supersonic to be able to detect?

How long does pregnancy do B to exceed to be able to detect?

First: in general, after 40 days of menopause, pregnancy can be shown under ultrasound. You can go to check in a week, so that you can see the fetal bud and fetal heart rate. If you go to check now, you may only see the gestational sac under ultrasound, but not the development of the fetus.

Second: the time of pregnancy is calculated according to the time of your last menstruation. When is your last menstruation? General B ultrasound can be detected in 42 days of pregnancy, but it may also be the process of menstrual cycle, late implantation, or fetal sac development is too small to check, can be observed for a week and then review.

Third: B ultrasonic examination is a common method to check early pregnancy, but the time of pregnancy is too short, do B ultrasonic examination will be misdiagnosed, after menopause about 45 days do B ultrasonic to see if you can see the gestational sac, if you do B ultrasonic after pregnancy, you are to check the growth and development of the fetus.

Fourth: after pregnancy, the first time to do B-ultrasound examination is 18-20 weeks after pregnancy. At this time, we can determine whether we are pregnant with singleton or multiple, and measure the fetal head circumference. It is easy to check the gestational age because of the small error of multiple indicators of fetal B ultrasound at this stage.

Fifth: B ultrasound can check out the date of pregnancy, but because B ultrasound is also a human operation, there are certain errors. Under B ultrasound, the gestational sac can be seen as early as 35 days, generally about 40 days. However, because the embryo is still small, the projection can not be clearly observed by B ultrasound, generally in 6-7 weeks.

Sixth: early pregnancy, not yet in the uterus, or may be ectopic pregnancy. But now it is not sure, and if it is almost 40 days, the possibility of non implantation is relatively small, and ectopic pregnancy can be seen by B ultrasound.

matters needing attention

Although B-ultrasound examination is very necessary for mastering the development of the baby, it is not that the more B-ultrasound examination, the better. We should take a relaxed attitude and cooperate with the doctor in the examination. If we are too nervous, it may affect the effect of the examination.