The yolk sac can be seen without buds depending on the week of pregnancy, 6 to 7 weeks of pregnancy without buds can be observed, after 8 weeks has not been seen buds should be considered empty sac pregnancy, clear diagnosis after the uterus to deal with.
After pregnancy through the ultrasound examination can be seen in the uterine cavity yolk sac, first to determine the intrauterine pregnancy to exclude ectopic pregnancy, did not see the fetal buds may be a relatively short period of time, generally in the 6 to 7 weeks of pregnancy can be seen through the ultrasound examination of the fetal buds, part of the women’s menstrual cycle is longer, the fertilized egg implantation time is relatively late, it may have to be delayed for a week before you can see the fetal buds.
After a week of delay, go to the hospital for review, if there has been no fetal buds and fetal heart development is considered to be an empty sac pregnancy, this situation is not able to continue the pregnancy, a clear diagnosis should be promptly go to the hospital to remove the uterus to deal with clean.