Six weeks without the formation of the fetus, ultrasound is a round or oval black shadow, that is, a gestational sac echoes, the sac has the embryonic buds, the general situation is not yet obvious heart tube pulsation, about 8 weeks of pregnancy before the embryo began to take on a human form.
At six weeks of pregnancy is the early stage of pregnancy, some pregnant women can see the gestational sac, with the further development of the gestational sac gradually appeared germs, heart tube beat, etc., but generally can not see the form of the fetus.
As the placenta has not yet formed, this time is in the early stage of pregnancy, pregnant women should pay attention to rest, avoid strenuous exercise, early pregnancy prohibit sexual intercourse. Oral folic acid is required until the 12th week of pregnancy. Early pregnancy if abdominal pain as well as abnormal vaginal bleeding, lumbago, etc., should promptly consult a doctor for ultrasound examination, to avoid the occurrence of preeclampsia.