Second Trimester...When?

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TyrantOfTheWeek's picture
Joined: 12/26/05
Posts: 1147
Second Trimester...When?

One would think I am in the know when it comes to this, but when exactly is the second trimester?? I have read lots of different opinions on different sites. I always thought that since 12 weeks is 3 months and pregnancy is supposed to be 9 months (Even though that is a cruel misconception. Pregnancy is actually 10 months) dividing it up like that would make sense.

Joined: 07/04/11
Posts: 316

I always thought it was the beginning of week 14

kridda_88's picture
Joined: 01/28/08
Posts: 1798

It's actually 13 weeks 3 days. Smile I usually just go by 13 weeks.

TyrantOfTheWeek's picture
Joined: 12/26/05
Posts: 1147

"kridda_88" wrote:

It's actually 13 weeks 3 days. Smile I usually just go by 13 weeks.

Ah, ok. I have heard as early as 12 weeks, and as late at 15 weeks.

always_1111's picture
Joined: 08/09/09
Posts: 442

I was just wondering the same thing. I finally hit 12 weeks today and one of my iPhone apps said I was in the 2nd trimester. All I know is that I feel like poo and my boobs hurt like a mofo right now. Whatever this is, I am calling it the first trimester still. Haha.

RoniBoo's picture
Joined: 06/07/11
Posts: 903

"MomtoQTs" wrote:

I always thought it was the beginning of week 14

It is confusing though because your right many websites say many different things. However, my doctor said when you turn 14 weeks Smile

emansmom's picture
Joined: 03/24/09
Posts: 752

I say I am in the second tri when I hit 13 weeks. I agree with Krista it is acutally 13 weeks 3 days though Smile

RonanTheBarbarian's picture
Joined: 05/10/10
Posts: 1084

Here's what I've read:
" The three basic ways to calculate trimesters
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.
by 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.
by 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.
by 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."

From
http://www.baby2see.com/trimester_calculator.html

TyrantOfTheWeek's picture
Joined: 12/26/05
Posts: 1147

"RonanTheBarbarian" wrote:

Here's what I've read:
" The three basic ways to calculate trimesters
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.
by 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.
by 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.
by 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."

From
http://www.baby2see.com/trimester_calculator.html

Um, yeah...That's not at all confusing :eek:

xMyLovelyLadyBumpx's picture
Joined: 02/17/11
Posts: 1198

Depends on who you ask, every book, doctor, midwife ect my ob with Kaylee said 13 weeks my current ob said 12 weeks. I have three pg books two say 12weeks one days 13 weeks.1 day.

Really its up to you (: