7 weeks without a fetal heart bud, yolk sac, hope?

At seven weeks of pregnancy, there is still hope to check the absence of fetal heart buds and yolk sacs. Because pregnancy calculations are not very accurate, ovulation will also occur delayed phenomenon, all seven weeks of pregnancy, do ultrasound examination may not be consistent with menopause time, but if ultrasound examination of gestational sacs is relatively large, and consistent with menopause time, there has been no original cardiovascular pulsation phenomenon, more can be considered embryonic dysplasia.