Trimesters

tailorhoyt · July 2014

When does the 3rd trimester begin? (How many weeks?) I've been told 26, 27, and 28 weeks. So. Confused.

Emerald27 · July 2014

I've always heard 28 weeks, so that's what I'm sticking to!

jesslinnn · July 2014

I always thought it was 27 weeks, so I just stick with that.

This helps explain why people say different days for when the trimester change.

Copy & Pasted:
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. Big Grin

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.

DaniGrace89 · July 2014

I'm sticking to 28. Not eager to have this trimester end. Getting kind of sad that we are over halfway done.

Sunflower555 · July 2014

DaniGrace89 said:

I'm sticking to 28. Not eager to have this trimester end. Getting kind of sad that we are over halfway done.

Same!

lrobi13 · July 2014

DaniGrace89 said:
I'm sticking to 28. Not eager to have this trimester end. Getting kind of sad that we are over halfway done.

Not me! I'm ready to finish baking this baby and get him on the outside...Although the first week of the 3rd tri has not been my fav. Come on October! !

MorganWP · July 2014

Im also going with 28. Makes the most sense to me.

melaniedel · July 2014

I go with 26.6. 12 weeks in a trimester does not make sense to me, so I do not go by 28. Plus I like being in the home stretch. I've been pg a lot in east few years though;)

MrsL2B · July 2014

I've just been saying that I'm currently "easing in" to the third trimester.

staryb · July 2014

I originally thought it was 28 weeks, but now I'm thinking 27. On Thursday I will be exactly 3 months from my due date and I'm 27 weeks on Friday. If pregnancy is more than 9 months then having only 3 months left should put me in the third trimester.

cozybluebear · July 2014

I just decided I was in the 3rd trimester sometime between 27 and 28 weeks. Woo Hoo for the home stretch. This last trimester is by far the hardest. Hopefully it goes quicker this time around.