trimesters.....?

iVillage Member
Registered: 03-24-2006
trimesters.....?
3
Thu, 03-22-2007 - 12:11pm

Hey:

I know I should remember this, but I just do not. I am almost 13 weeks now. I was wondering, when does the firt trimester end? What is the breakdown of weeks for trimesters?

Thanks!
( you are all such wonderful people.... I enjoy being here.)

Scarlett




Edited 3/22/2007 12:21 pm ET by srobinson2006
iVillage Member
Registered: 05-18-2006
Thu, 03-22-2007 - 12:32pm

Here ya go:


By definition, the word ‘trimester’ divides a time into three equal parts. However, pregnancy is not neatly divisible by three. If you calculate from the last menstrual period (LMP) with a 28-day cycle, a pregnancy lasts 40 weeks or 10 lunar months. If you calculate from probable conception, again based on a 28-day cycle, you are left with a gestational period of 38 weeks. Neither of these is divisible by three. As a result, you get somewhere in between 12 2/3 weeks and 13 1/3 weeks. Conventionally, it is common to say that the first trimester ends at 12 weeks (12 weeks from the first day of the last period). The second trimester proceeds from 12 to 28 weeks and the third trimester extends from 28 to 40 weeks.


Welcome to the 2T Scarlett!!!


 
iVillage Member
Registered: 03-24-2006
Thu, 03-22-2007 - 1:27pm

Tara:

Thanks! I knew I must be getting close, but I couldn't remember and can't find it in any of my books.... a sigh of relief.... you are great!

Scarlett

iVillage Member
Registered: 10-16-2006
Thu, 03-22-2007 - 4:41pm

Hey, Scarlett! Come down and join us in 2T! I'll see you there! We made it!

Tami