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due date calculator on here does not match my ultra sound

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Old 03-21-13, 01:32 PM
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Default due date calculator on here does not match my ultra sound

I tried the due date calculator on here and it says im due june 27th and that i am 26 weeks pregnant. but going off my last ultra sound i should be 27 weeks today. and that my due date would be the 26th. my last ultra sound was 2-6-13 and it says 20 weeks 5 day. so how far long is that. i am adding up 27 weeks. Is that right or am i wrong.
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Old 03-29-13, 06:02 PM
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Ultrasounds cannot determine and exact due date - it is the best guesstimate based on the development of the fetus. Due date calculators can be off especially if you do not know the exact date of your LMP or if your periods are not exactly the same each month. There is always going to be a bit of variation. From what you are saying it looks like there is only one day difference? I used the due date that my doctor gave me.
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