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The yolk sac is the first element seen in the gestational sac during pregnancy, usually at 5 weeks gestation.
en.wikipedia.org/wiki/Yolk_sac
Upside: Excellent user-compiled detail on the yolk sac including excellent graphics
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The yolk sac is the first element seen in the gestational sac during pregnancy, usually at 5 weeks gestation.
www.nationmaster.com/encyclopedia/Yolk-sac
Upside: Excellent definition and pictures about yolk sacs
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In early pregnancy, the yolk sac functions as a source of nourishment for the developing baby before ultimately being absorbed by the baby as a part of the gut. The yolk sac is the first thing to ...
miscarriage.about.com/od/diagnosingpregnancyloss/f/noyolksac.htm
Upside: Good overview on not seeing a yolk sac in an ultrasound
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any similar experences? For some women , at 6 weeks can be too early to see other things through an ultrasound. I wouldn't worry. I had an ultrasound as early as 5 and half weeks due to cramping ...
answers.yahoo.com/question/index?qid=20081105080645AAZ0e5q
Upside: Answers to user generated question on only seeing a yolk sac at 6 weeks
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Ultrasound in early pregnancy at 6 weeks from last menstrual period Ultrasound in early pregnancy 6 weeks from last menstrual period Ultrasound picture of early pregnancy at 6 weeks and 1 day of ...
www.advancedfertility.com/ultraso3.htm
Upside: Picture of 6 week ultrasound showing fetal pole and yolk sac
Downside: None
This is my second consecutive miscarriage. My OB didn`t officially state that I have miscarried, but I am positive about my dates. I conducted an ovulation test and know that I ovulated 24-36 hours ...
www.netwellness.org/question.cfm/47690.htm
Upside: Q&A with a doctor about seeing a yolk sack but no baby during a miscarriage
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I had a ultrasound today and I am 6 weeks 2 days by ultrasound and 6 weeks 4 days by last period. There was a heartbeat (good news I know) but the doctor was a little concerned about the yolk sac. It ...
www.pregnancy.org/question/yolk-sac-not-perfectly-round
Upside: Short Q&A on yolk sac not being round
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Two years ago I had an ectopic pregnancy that resulted in my tube being removed.I was expecting to be pregnant but took a test on September 2nd and it was only faintly positive. Then starting on ...
www.pregnancy.org/question/missing-yolk-sac
Upside: Short Q&A on not seeing a yolk sac in early pregnancy
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My girlfriend is 7and a half weeks pregnanat according to her last period. She went in tuesday and the doctor said they are 100% sure this wont be a viable pregnancy (no heartbeat). She went back in ...
www.babycenter.com/400_what-does-an-over-sized-yolk-sack-mean_2985820_165366463946.bc
Upside: Community replies to user question on yolk sac size
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Definition: This is the first thing that becomes visible inside the gestational sac in an early pregnancy ultrasound. The yolk sac nourishes the developing baby (embryo) until the circulatory system ...
miscarriage.about.com/od/pregnancylossbasics/g/yolksac.htm
Upside: Good definition of what a yolk sac is
Downside: Limited details