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When is first tri officially over?

BunnyintheYardBunnyintheYard
in Pregnant after IF
I keep finding conflicting info.  Is it 12 weeks or 13w3d? 
dx'd with severe endo and poor egg quality 3 IUIs were all BFN IVF #1 = c/p IVF #2 = BFN IVF #3 = beautiful baby girl born 2/2011; 8/2011 Surprise BFP - natural m/c at 8w; TTC #2 2011-2012; 2 IUIs = BFN; IVF #1 = BFP 9dp5dt beta = 328; 11dp5dt = 650; 13dp5dt = 1114; 18dp5dt = 4747 BabyFetus Ticker
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Re: When is first tri officially over?

  • Temp893722312503334Temp893722312503334

    depends where you look (what site, book etc.) but officially its 13w3d

    13.3 x 3 = 39.9 weeks. 

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  • OscarQOscarQ member

    There are three different ways of measuring trimesters - Development (12w), Gestation (13w3d) and Conception (14w5d)

    Handy calculator for all three measurements... 

    https://www.baby2see.com/trimester_calculator.html 

    General consensus on the boards (that I've seen) is 13w3d. 

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  • GenRN45GenRN45

    IMO - measuring by gestation isn't accurate. The only accurate measure of trimesters is fetal development. Which makes 2nd tri start the first day of the 13th week, or 12w0d pg.

    For your specific dates, plug in the requested info here .

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  • OrangeSmokeOrangeSmoke member

    Personally, for me it was when I got the result of my NT scan back.

    That's when I felt comfortable sharing the news!

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  • BunnyintheYardBunnyintheYard

    Thanks ladies!  I think I'm in the Development Camp as well... so I guess I am in 2nd tri.  Woosh!

    OrangeSmoke, I feel the same way!

    dx'd with severe endo and poor egg quality 3 IUIs were all BFN IVF #1 = c/p IVF #2 = BFN IVF #3 = beautiful baby girl born 2/2011; 8/2011 Surprise BFP - natural m/c at 8w; TTC #2 2011-2012; 2 IUIs = BFN; IVF #1 = BFP 9dp5dt beta = 328; 11dp5dt = 650; 13dp5dt = 1114; 18dp5dt = 4747 BabyFetus Ticker
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