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Old 05-10-2013, 09:39 AM   #1
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When does the 2nd trimester start?

12,13, or 14 weeks? There's conflicting info everywhere I look.

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Old 05-10-2013, 09:45 AM   #2
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Re: When does the 2nd trimester start?

I think it begins when you are 13 weeks and starting the 14th week. I think the language there makes it confusing. Like you have completed 13 weeks but since you are starting the 14th week some places say "the 14th week" when really it is at 13 weeks total. If that makes sense. That's what my pregnancy book says anyway!
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Old 05-10-2013, 09:46 AM   #3
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Originally Posted by Solomon's Mama
I think it begins when you are 13 weeks and starting the 14th week. I think the language there makes it confusing. Like you have completed 13 weeks but since you are starting the 14th week some places say "the 14th week" when really it is at 13 weeks total. If that makes sense. That's what my pregnancy book says anyway!
So if I turn 13 weeks on Sunday I have another week and then it's the 2nd. trimester? My 6th pregnancy and I still don't know the answer!!
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Old 05-10-2013, 09:48 AM   #4
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Re: When does the 2nd trimester start?

it's very confusing...because some look at is from when your lmp was making your pregnancy 40 weeks divided into 3 sections makes it 13.33 weeks along (2nd tri would then be 26.67)

or some do it by conception making it 38 divided by 3...12.67 weeks and 25.33

I usually say I'm in the 2nd tri at 13 weeks and 26 weeks (since I've never gotten to 40 weeks on my pregnancies )
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Old 05-10-2013, 09:54 AM   #5
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Re: When does the 2nd trimester start?

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Originally Posted by TinaDeanette View Post
So if I turn 13 weeks on Sunday I have another week and then it's the 2nd. trimester? My 6th pregnancy and I still don't know the answer!!
LOL, this is my third and I am surprised by some of the questions I have as well! When you turn 13 weeks Sunday, that that will be the start of the second trimester. I'll be 13 weeks next Thursday and then I'll be in the second trimester too
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Old 05-10-2013, 10:02 AM   #6
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Woo hoo! 2nd trimester here I come!
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Old 05-10-2013, 11:54 AM   #7
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Re: When does the 2nd trimester start?

Like others have said, I always understood about 13 weeks to be the 2nd trimester. You're almost there!
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Old 05-10-2013, 11:56 AM   #8
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Re: When does the 2nd trimester start?

This calculator will give you the 3 different ways to calculate trimesters...personally I always wanted to go with the earlier dates

which according to the calculator developmental trimester I'll be entering the 3rd tri on my birthday this month
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Old 05-10-2013, 11:59 AM   #9
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Pregnancy dating is so confusing. I was just thinking about how I am 18wks today, in 2wks I'll be halfway, but if I add 18 and 18 (36) I still have a month to term. Or maybe it's just my really horrible math skills.
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Old 05-10-2013, 12:01 PM   #10
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Re: When does the 2nd trimester start?

but months don't have only 4 weeks in them (only February has exactly 4 weeks) every other month is 4.5 weeks long
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