HomeQuestions & Answersby my lmp i was 6 weeks 6days pregnant but usg showed 4weeks 4 days is that ok and there is gestational sac but no yolk sac and fetal pole by abdominal scan
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by my lmp i was 6 weeks 6days pregnant but usg showed 4weeks 4 days is that ok and there is gestational sac but no yolk sac and fetal pole by abdominal scan
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A. The gestational age is calculated by the number of weeks since the last menstrual period; however, this method generally assumes a 28-day cycle with ovulation occurring on the 14th day. Many women have shorter or longer cycles and do not ovulate on the 14th day -- and this could affect what an ultrasound should show in the development of the pregnancy.if a woman has a 35-day menstrual cycle, she most likely ovulates around the 21st day of her menstrual cycle (because ovulation usually occurs two weeks before the menstrual period would begin). If the woman became pregnant and had an ultrasound scan six weeks from her last menstrual period date, her normally developing pregnancy would measure with a gestational age of five weeks, because the gestational age dating system assumes that she would have ovulated a week earlier than she did.
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