Silly question!

[Sunkissed19]

when does the second trimester actually start? i thought it was the 13th week but i was looking at pregnancy trackers and some people who are at 13  weeks still say first trimester so is it the 14th week? lol i cant believe i dont know this....but i dont!
thanks ladies!

[bluegenie2003]

I just found this online.  

There are basically three ways of dividing up a pregnancy into the three trimesters; they are by: Development,   Gestation,   Conception. They give different dates for when the second trimester begins and for when the third trimester begins. Your health care provider might prefer to use the Development method, while another Midwife or Doctor may use the Gestation method.
I am sure they do that just to confuse pregnant women.  

Development:
This uses actual developmental stages to divide up a pregnancy. From LMP to 12 weeks the embryo develops all the major organs and becomes a fetus. From 12 weeks to 27 weeks the fetus continues developing and reaches viability. From 27 weeks on the fetus finishes development and prepares for delivery. Here the second trimester begins at 12w 0d and the third at 27w 0d.

Gestation:
With this method you take the 40 weeks of gestation and divide by three. Here the second trimester begins at 13w 3d and the third at 26w 6d.

Conception:
This method is where you take the 38 weeks of post conception development, divide by three, and add two weeks. Here the second trimester begins at 14w 5d and the third at 27w 3d.


I think I'll go by Development..lol

[Sunkissed19]

thanks, that makes sense....sounds right. thats about what i was thinking...ugh a week and 2 days to go for me then

[Victoria01]

If you take 40 weeks divided by 3 you get 13.3 weeks. So, I think, by the time you end your 13th week, you should be consider in your 2nd trimester. :) Most people still use 12 weeks, but that only takes you to 36 weeks and a pregnancy, usually as you know, is 40 weeks. :) Not sure if this helped or not, but it's the only way it makes sense to me. :)

[Willow10]

I hear a bunch of different things..but one book I have does say it starts at week 14..I woulda liked to think week 12 ha

[crissy578]

You are not alone. I am wondering the same thing. I am 13 weeks and I wonder if I am in my second trimester now.