Pregnant 54 days, only the embryo sac does not have the embryo bud how to return a responsibility

Fifty-four days of pregnancy, women for prenatal examination found pregnancy sac, but no fetal bud appears, there may be a normal phenomenon, mainly caused by female pregnancy time is too short. It is recommended that pregnant women can wait a week or so, and then go to the hospital to check once to determine whether there are fetal buds.