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What if you know your LMP (which is regular 28 day cycle) but doctors change EDD going by first ultrasound. Why, did I ovulate later or what??
If my LMP according to my first US at 9 weeks was a day off from what I told the doctor is there still a 5 day error margin?
When a doctor says margin of error is 3-5 days in first trimester us are they talking about lmp, due date, or conception date?
Lmp may 5th 2014 dtd w guy a may 11th guy b 15th doc I ovulated anywhere from 15th thru 20th..fIrst sono was july 1st I measured 8wk n3day Edd 2/8/15?
Ultrasound on 4/12/13, i was 9w4d doc say i conceived on 2/1/13. But 2/1/13 was the 4th day of lmp(21days cycle) could ultrasound be off a few days?
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