Well, sometimes the position of the embryo during the scan can make it seem like there's no yolk sac. Later scans, when the embryo shifted a bit, showed that the yolk sac was there all along. One of my friends had this situation and she now has a healthy baby.
There are many factors at play. It could be that the initial scan was done too early to accurately detect the yolk sac. Some women had a healthy pregnancy after being monitored closely. Their doctors checked hormone levels, and as those stabilized, the yolk sac became visible in subsequent scans. Also, different ultrasound machines have different levels of accuracy, and a more advanced machine in a later scan might have picked up the yolk sac that was initially missed.
One reason for a positive outcome could be that the first scan was inaccurate. Later scans often show the yolk sac when it has had more time to develop. For example, I know a woman who was told there was no yolk sac at 6 weeks. She was worried sick, but at 7 weeks, there it was. So don't lose hope right away.
In some cases, the body just takes a bit more time. There was a situation where a woman had no heartbeat detected at 7 weeks, but she had excellent prenatal care. She ate well, rested, and avoided stress. By the 8 - week scan, a strong heartbeat was visible. So, taking good care of yourself during pregnancy can give the embryo that extra boost it might need.
It's possible to have a successful pregnancy. I had no sac at 5 weeks. I was really worried, but my doctor said it could be because it was too early. And indeed, at 6 weeks, there it was. So, don't lose hope.
Yes, there are success stories. It might be that the dating of the pregnancy was off slightly. Maybe it was actually a bit earlier than thought, and the yolk sac hadn't developed enough to be visible at what was thought to be 6 weeks. Another possibility is that the equipment used for the ultrasound wasn't sensitive enough. In any case, with proper monitoring, some of these pregnancies went on successfully.
I know a woman who had no visible yolk sac at 6 weeks. She was really worried at first. But her doctor told her to wait and have another scan in a week or two. Turns out, the yolk sac was there in the next scan and she had a normal pregnancy. Sometimes, it just takes a little more time for the development to be visible.
It could be due to a miscalculation of the gestational age. If the date of conception was misjudged, then what was thought to be 7 weeks might actually be a bit less. In such cases, the yolk sac might just not be visible yet but will become visible as the pregnancy progresses. Additionally, some women have hormonal imbalances that can initially slow down the development process but with proper medical care and time, the pregnancy can be successful.
It's not very common, but it does happen. Maybe around 10 - 15% of cases where there is no visible yolk sac at 7 weeks can still result in a successful pregnancy. This is just a rough estimate though, as it can vary depending on various factors like the mother's health, the quality of the embryo etc.
One success story could be that after further testing, it was discovered that the pregnancy was just developing a bit slower than usual. The fetus eventually showed up on later scans and went on to have a normal pregnancy.
There are also instances where the body just needed a bit more time to develop. Maybe there were hormonal imbalances initially. But with proper rest, a healthy diet, and close monitoring by the doctor, the pregnancy progressed normally. The woman might have been under a lot of stress which was affecting the development, but once she managed to relax and follow the doctor's advice, the situation improved and she had a successful pregnancy.
One success story could be that after further testing, it was found that the pregnancy was just developing more slowly than expected. The fetus eventually became visible on later scans and developed normally. Another instance might be that it was a misdiagnosis due to equipment error, and the pregnancy continued without issues.