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    L1984's Avatar
    L1984 Posts: 1, Reputation: 1
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    #1

    Aug 13, 2009, 05:00 AM
    Confusion over lmp and scan dates!
    Hi everyone, I wonder if you can help me? My lmp date is 10/5/09 which would make my due date 14/2/10. I had a scan at 9 weeks and 4 days which changed my due date to 13/2/09 then at my 12 scan I was measuring 3 days ahead so changed my due date to 11/2/09. I am certain of the date I conceived (24/5/09) so how can the dates change? Is it based on how the baby is measuring?
    ang8318's Avatar
    ang8318 Posts: 299, Reputation: 27
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    #2

    Aug 13, 2009, 05:11 AM

    Everything is an educated guess when it comes down to the "age" of a baby on a scan. When I pregnant with my son my due date according to my lmp would have been 7/14, a scan at 6 weeks said 7/31, scan at 18 weeks said 7/13. Usually there is a two week window because you can 2 weeks early or 2 weeks late. I ended up having my son on the 7/19-in the middle of the dates. Hope everything goes well for you.
    J_9's Avatar
    J_9 Posts: 40,298, Reputation: 5646
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    #3

    Aug 13, 2009, 05:56 AM
    The due date can actually vary by almost 2 weeks. Since it is impossible to tell when the sperm actually me the egg, we have to guess according to your LMP.

    You are only talking about a couple of days here. You could deliver on any one of these due dates... two weeks before... two weeks after... or anywhere in between.

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