When Does The 2nd Trimester Begin

5 Replies
soontobemommie0730 - January 16

Hi im 11 weeks right now and i was just curious when does the 2nd trimester begin?? ive heard soo many things so im so confused...some say 13...some say 14...15...16...yeah i think you get it lol...well please help me clear this up thanks!

 

jendean00 - January 16

13 weeks 1 day is considered to be the start of your 2nd trimester.

 

jessica72 - January 16

You're officially in your second trimester at the end of 12 weeks or rather at 13 weeks. There are sooo many variations out there, but this is what my doc told me.

 

Tracy88 - January 16

Like Jendean said, the first day of week 13.

 

jen327 - January 16

Wow, I might be able to help! I too want to know when I make it to the magical second trimester! I found this site that calculates your second trimester and there are various dates and here is what it explains baby2see.com/trimester_calculator.html The length of the trimesters is often a source of confusion. The word trimester means 'three months'. Three periods of three months each, gives pregnancy a beginning, a middle and an end period. These periods match the developmental stages to divide up a pregnancy. From LMP to 12 weeks the embryo develops all the major organs, becomes a fetus, and the placenta takes over control. 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. Does it really matter exactly when you are out of the first trimester or start the third trimester? No. When the trimesters start and end depends on who you ask, which book you read or what website you visit. Most health care providers actually talk about your pregnancy in weeks, rather than months or trimesters. There are basically three ways of dividing up a pregnancy into trimesters: development, gestation, conception. They give different dates for when the second trimester begins and for when the third trimester begins. 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.

 

ljrodrig - January 18

All my books say 14 weeks.

 

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