Do you see the pregnancy sac after 23 days in the same room?

23 days after the same room B ultrasound examination can not see the gestational sac, gestational sac in pregnancy about 40 days will be seen through B ultrasound, part of the late ovulation of pregnant women may appear in pregnancy 50 days. Suggestions: early pregnancy should pay more attention to rest, folic acid supplement, can prevent intrauterine fetal neural tube defects.