An ultrasound done after pregnancy suggests no echo in the uterus, a condition that is likely to be pregnant. No echo is a descriptive language in ultrasound, because the gestational sac is relatively small, the duration of pregnancy is short, the yolk sac, fetal buds, fetal heart can not be seen, so the ultrasound often suggests that there is no echo. Don’t worry too much about this situation, as the weeks of pregnancy increase, the fetal buds and fetal heart will gradually show up. If after a period of time repeated ultrasound examination, still suggests no echo in the uterus, and can not see the fetal buds and fetal heart, at this time may be a manifestation of embryonic failure, you need to check the blood levels of progesterone and HCG, a comprehensive assessment of the intrauterine condition of the fetus.