ultrasounds only give you a range. they can't pin point an exact day. in the first trimester its about a week either way and the second trimester its close to two weeks either way. you go by your first ultrasound because the earlier the ultrasound the more accurate
its a range though, not an exact date bc all babies grow diff. so if by lmp you were 6wks and by us you were 6+3 thats almost as cloee as your going to get. baby will measure sl7ghtly diff each time bc of the rate its growing at
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