I. am. so. confused.

jennnyboomboom · October 2014

When the hell does the second trimester start?! I'm 13 weeks today and thought all along that it started on week 13 but now I'm hearing week 14? I've been Googling this all morning and nothing is making sense. Then I found this fancy calculator and there are so many dates to choose from. I'm baffled!

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

jennnyboomboom · October 2014

I was so excited about getting to week 13 only to have to hold off for 1 more week! This is blasphemoy!

jenanns · October 2014

I am confused about that too! I thought at first it was 12 weeks ( which doing the math doesn't make sense) but yes I have read 13 and 14 so not sure...

texasmama15 · October 2014

My understanding is that there are 14 weeks in each trimester so technically week 15 is second tri...

lovebeingblonde · October 2014

My doc swears by 14. Said that a lot say 12 (3x4)... but she said with those extra two weeks at the beginning, before you're actually pregnant, its 14.

Aimothy · October 2014

Most "resources" will say that you finish out first trimester in your 13 week. Week 14 is the start of the second trimester.

Or as PP said....eternity.

gsancho · October 2014

Now it's considered week 14. I think the old school way of thinking was 12 weeks. Although I still get a little confused if 2nd tri starts on 14w0d or at the end of 14wks. I think 14w0d?

Pintobean39 · October 2014

T1green said:
I thought there about 4 weeks in a month. Multiply that by 3 and it's 12 so week 13 would be second tri right? Or do I need to go back to second grade?

There are actually 4.33333 weeks in a month multiply that times 3 and you get 13.999, rounded up to 14.

Second trimester starts at week 14.

jennnyboomboom · October 2014

T1green said:

This was a bad question to ask people with pregnancy brain. Haha!
I just devided 40 by 3 and got 13.3 repeating but if you round it then it's just 13. So 13 weeks?

My thoughts exactly! I swear, I have common sense, but what is the deal?! It makes absolute sense to just do simple math, dividing 9 months by 3 but "sense" is not coming so easily to me these days. Literally everything I read is conflicting. I guess I could do the logical thing and just ask my OB at my next appointment, but what's the point of the internet then if I can't just Dr.Google everything??

Pintobean39 · October 2014

Oh and to blow your mind even more it's actually 42 weeks not 40.

jennnyboomboom · October 2014

I just checked my email and got this from Alpha Mom, I had to share:

Welcome to the second trimester! Well, the second trimester as defined by MOST pregnancy books and calendars, although I believe there may be one or two that count week 13 as part of the first trimester (cough cough BabyCenter Essential Guide to Pregnancy and Birth cough), but they can suck eggs, frankly. I would never do that to you. We are in the second trimester, baby. I promise it gets better.

So suck it, 14 weeks! I want to be in you second trimester!

katietopaz · October 2014

This hurts my brain more than it should. Math.

nursej519 · October 2014

The trimesters are not equal in length.. Dividing does not tell you the answer.

Pintobean39 · October 2014

I find it hard to believe that people actually think their are only 4 weeks in a month. I know I'm an accountant and my brain just works that way. I've always realized not every month is 28 days so it's not possible to be 4 weeks.

My husband doesn't get it either. Why doesn't everyone not think like me :-)

lgsdesigner · October 2014

Technically- 13 weeks and 2 days.

FreddyisReady · October 2014

I'm using this

DawnLilly · October 2014

Wait until the kid is born. It's how many months old? :-/

awoo22 · October 2014

From what I've been reading and hearing, the 2nd trimester starts at week 14. So you have to complete week 13 to be finished with the first tri.

LolaCachia · October 2014

My Dr said 13w2d. Funny that there are so many different answers!

sarahchrismck · October 2014

This thread just made my brain explode.

But... my doctor says week 14.

mlbrooks619 · October 2014

Most I've read/seen/been told by my doc is 2nd tri starts at beginning of week 14.

But I am loving the logic on everyone's answers, keep em coming.

lala5507 · October 2014

8-}

texasmama15 · October 2014

So are we all in agreement that week 14 starts second tri?!? :-bd

lgsdesigner · October 2014

LolaCachia said:

My Dr said 13w2d. Funny that there are so many different answers!

Both my old OB and midwife said this. So did a few books I had. But-- whether you go with 13wks and 2 days or 14 weeks, it's close enough.

abbalish · October 2014

So I will be 13 weeks on Monday....is that technically the "start of week 14" and thus the second trimester? I feel like I should not be this confused by this concept, ha.

tinyjoys · October 2014

14 weeks. Third starts at 28.

jbj 7497 · October 2014

I can't decide if this thread made me smarter or dumber. I've always heard 13 full weeks.

lgsdesigner · October 2014

Try this ladies:

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

From site:

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 theDevelopment 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 into three equal stages. 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, into the three equal trimesters. Here the second trimester begins at 14w 5d and the third at 27w 3d.

yasminhosny · October 2014

Months do not translate in to weeks in pregnancy. It is not calculated like 4 weeks And 9 months. Week are gestational weeks which means they are counted from your last period (which is before fertilization occurs). Month is calculated from supposedly fettilization period. So you could say im 13 weeks pregnant or for example i go to a new month every 4th of a new month. Thats for instance. Hope that helps!

lovebeingblonde · October 2014

Pintobean39 said:

I find it hard to believe that people actually think their are only 4 weeks in a month. I know I'm an accountant and my brain just works that way. I've always realized not every month is 28 days so it's not possible to be 4 weeks. My husband doesn't get it either. Why doesn't everyone not think like me :-)

I'm an accountant too. Struggle is real yo.

ElleMuffin · October 2014

I swear I am a reasonably intelligent adult but my mind is totally blown at the realization that a month does not equal 4 weeks. How have I made it this far without realizing this?!? Understanding trimesters is definitely being added to my "can't even" list during this pregnancy along with touching raw meat and sleeping through the night.

RustyGirl3 · October 2014

texasmama15 said:

So are we all in agreement that week 14 starts second tri?!? :-bd

supersarah77 · October 2014

It is confusing with all the conflicting info. I think it's 40 weeks divided by 3. But, it doesn't really matter anyway.

ellab043 · October 2014

I'm just going with 12 weeks. It's what the prevailing thought was when I had DD so I'm sticking with it. AND it makes me feel better :-)

sml72978 · October 2014

The American pregnancy association which is what dr's go by says it starts with week 14 and goes through week 26.

moniafriends · October 2014

Probably 14 week

nothing about pregnancy makes sense, not even math

123hollydolly · October 2014

Does this mean I have closer to another month of sickness instead of just two weeks?!?!?!

I. am. so. confused.

Re: I. am. so. confused.

Me 33, DH 37 -- TTC since Jan'12 -- Low AMH (0.78) & endo, SA w/ low motility
IUI's 1-3 = BFN, IVF converted to IUI 4/13 = BFN
IVF 1.2: 8R 6M 4F -- 2 blastocysts frozen, FET 8/15 = BFP!!
Beta #s = 445;1,098; 9,545 -- EDD 5/2 -- Team Pink!