20 days pregnant usually refers to 20 days of menopause, usually can not see the pregnancy sac.
For 20 days pregnant women, this time is in the early stages of pregnancy, this time has not yet appeared in the body of hormone changes, so generally will not appear early pregnancy reaction, and menstruation has not yet appeared menopause, fertilization also did not bed or just bed, the embryo is very small, so ultrasound and can not see the pregnancy sac.
Usually after 35 days of pregnancy, the pregnancy sac can just be seen, and the specific and women’s menstrual cycle is regular or not has a lot to do with. For women with regular menstrual cycles, the sac may be visible after 35 days of pregnancy, while for women with irregular menstrual cycles, the sac may be visible later, even after 40 days.
Pregnant women are advised to relax, not to be anxious and nervous, and to go to the hospital for regular checkups to see how the pregnancy sac is developing.