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![Table 4 from Size of Yolk Sac by Ultrasonography and Its Correlation with Pregnancy Outcome | Semantic Scholar Table 4 from Size of Yolk Sac by Ultrasonography and Its Correlation with Pregnancy Outcome | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/9700257e6764355f2cfc584344a8a517a8c37ee6/4-Table4-1.png)
Table 4 from Size of Yolk Sac by Ultrasonography and Its Correlation with Pregnancy Outcome | Semantic Scholar
![Maternal physical activity affects yolk sac size and growth in early pregnancy, but girls and boys use different strategies | Scientific Reports Maternal physical activity affects yolk sac size and growth in early pregnancy, but girls and boys use different strategies | Scientific Reports](https://media.springernature.com/m685/springer-static/image/art%3A10.1038%2Fs41598-023-47536-4/MediaObjects/41598_2023_47536_Fig2_HTML.png)
Maternal physical activity affects yolk sac size and growth in early pregnancy, but girls and boys use different strategies | Scientific Reports
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![Is the sac suppose to be empty? This isn't a hate post, I just have never had a scan before 6 weeks of pregnancy so I'm not sure what it's suppose to Is the sac suppose to be empty? This isn't a hate post, I just have never had a scan before 6 weeks of pregnancy so I'm not sure what it's suppose to](https://i.redd.it/86m6r494wk4a1.jpg)
Is the sac suppose to be empty? This isn't a hate post, I just have never had a scan before 6 weeks of pregnancy so I'm not sure what it's suppose to
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![Two sacs, only one embryo visible at 7 weeks. Any chance the other is just hiding? : r/parentsofmultiples Two sacs, only one embryo visible at 7 weeks. Any chance the other is just hiding? : r/parentsofmultiples](https://preview.redd.it/1u6gz990iz681.jpg?auto=webp&s=6d10b73848b31f668f4c6b9eef8c40520e60e023)