Empty Gestational sac in the uterus. 

This video shows an Empty Gestational sac in the uterus.
An absent fetal pole can mean several things, including Blighted ovum: A blighted ovum (anembryonic pregnancy) is when a fertilized egg implants in the uterus but doesn't grow into an embryo. This causes an early miscarriage. Too early: If a pregnancy isn't far enough along, you may not be able to see the embryo yet.
It is usually identified at six weeks with vaginal ultrasound and at six and a half weeks with an abdominal ultrasound. However, it is not unheard of for the fetal pole to not be visible until about 9 weeks.
The general recommendations are to wait two weeks if we only see a gestational sac and at least 11 days if a gestational and yolk sac are seen without a fetal pole. I prefer to wait two weeks for the next ultrasound in both of these scenarios.
No, an empty gestational sac will not turn into an embryo. The formation of the embryo occurs within two weeks of conception. By the time the gestational sac is formed, the cells should have already formed the embryo.
The embryo (sometimes called the fetal pole early on) becomes apparent at 6 weeks of gestation as a relatively featureless echogenic linear or oval structure adjacent to the yolk sac, initially measuring 1-2 mm in length. At this point, the MSD is approximately 10 mm.
The fetal pole is usually identified at ~6.5 weeks with transabdominal ultrasound imaging and at ~6 weeks 2 with transvaginal ultrasound imaging, although it may not be seen until ~9 weeks in some cases. A fetal heartbeat should be detected when the fetal pole measures 7 mm or more.
There are particularly no medications for fetal pole development as such. The reasons why the fetal pole is not visualized on an ultrasound could be because 1. it is still a very early pregnancy. 2. It is an unhealthy pregnancy.
A blighted ovum, also called an anembryonic pregnancy, occurs when an early embryo never develops or stops developing, is resorbed, and leaves an empty gestational sac. The reason this occurs is often unknown, but it may be due to chromosomal abnormalities in the fertilized egg.
What does it mean when there is a sac but no fetal pole?
An absent fetal pole can mean several things, including Blighted ovum: A blighted ovum (anembryonic pregnancy) is when a fertilized egg implants in the uterus but doesn't grow into an embryo. This causes an early miscarriage. Too early: If a pregnancy isn't far enough along, you may not be able to see the embryo yet.
In which week do the yolk sac and fetal pole appear?
The yolk sac begins to develop during the second week of gestation (pregnancy). A healthcare provider can see the yolk sac using transvaginal ultrasound starting at about week five. The yolk sac grows as pregnancy progresses from week five to week 10.
Having a blighted ovum should not affect your chances of conceiving again in the future, and one study even found that for women who conceive within the first six months immediately after a miscarriage, there was a higher likelihood of a healthy, full-term pregnancy.
That said, the 7-week ultrasound could also reveal a hard truth about the health of your pregnancy. If there are no signs of pregnancy or inconsistent signs, like a large gestational sac without any yolk sac or fetal pole, it may mean you have a blighted ovum or are otherwise miscarrying.
Gestational Sac can usually be detected by 6 weeks of gestation on transvaginal ultrasound.
Approximately six weeks after a pregnant woman's last period, we can see a small fetal pole, one of the first stages of growth for an embryo, which develops alongside the yolk sac.