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    Twins2013's Avatar
    Twins2013 Posts: 1, Reputation: 1
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    #1

    Nov 9, 2012, 06:12 PM
    How accurate is a ultrasound at 6 weeks? How is it calculated?
    According to my ultrasound my EDD is feb19/2013. I read that the 40 weeks is calculated from LMP. The first 2 weeks is the gestational period. That would be may15/2012, conception may29/2012. Is this the actual estimated time I conceived (may29th?) give or take a few days? My question is was the 29 th when I conceived? I am now 25 weeks and 1 day pregnant according to U/S. Does that mean the babies are 23 weeks and 1 day? That the extra 2 weeks are gestational? Also how long can sperm live in a women's body? I read 2-3 days and then 5-7 days? I had my period end may 16, and had sex that night. What are the chances that the sperm lived Max life spans of 7 days making conception may22 and making my U/S off a week? Can a transvaginal U/S be off 1-2 weeks? My first U/S was at 6 weeks 2 days.
    Alty's Avatar
    Alty Posts: 28,317, Reputation: 5972
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    Nov 9, 2012, 06:16 PM
    If this is a question of paternity than the only option is a DNA test after the baby is born.

    Ultrasound is a best guess and can be off as much as a month. There's no way to determine by ultrasound an accurate conception date when the dates of possible conception are only days apart.

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