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When does the second trimester start?

Poll Results: When do you consider the second trimester to start?

  • 27% (6)
    12 weeks
  • 59% (13)
    13 weeks
  • 13% (3)
    14 weeks
  • 0% (0)
22 Total Votes  
post #1 of 11
Thread Starter 

There are so many opinions about when the second trimester starts. When do you consider it to start, and why?

post #2 of 11

Not soon enough, in my opinion!!!


post #3 of 11

Eh... I usually think of 12 weeks as being end of first trimester.  I voted for 13 weeks though.


I guess I think of 12 weeks because nausea for most people has generally subsided by that point.. and chances of miscarriage greatly drop.. so those two factors combined seem to indicate a new 'phase' in pregnancy.


That said, since all my babies have been born at 41w+, if I'm truly breaking up my time into thirds, it's closer to 14 weeks ;)  ... but sometimes, just hitting new milestones is motivation to keep plugging forward.  I say, if you need that motivation early on, then tell yourself you hit the second trimester at 12 weeks -- whatever works best ;)  (so much of pregnancy is mind games anyway!)

post #4 of 11
i say at 12+1....so 13 weeks.o
post #5 of 11

Right, I think of the first trimester as being 12 full weeks, which means the second trimester starts the first day of the 13th week.

post #6 of 11

I wish I thought it was 12 weeks- and I think I will consider myself in my second trimester after I am through with my 12th week however- pregnancy in uneventful first pregnancies left alone according to an extensive study in first time moms is 41.5 weeks.  In second time moms that is reduced by almost a week, therefore if we are pregnant for 41.5 weeks (minus 2 weeks because we all know conception takes place 2 weeks after the start date when "they" start counting)  39.5 weeks divided by 3- (thinking this is starting from conception is 13.16- so I assume you are truly 1/3 of the way through gestation after your 14th week.  If you count the two weeks before conception then 41 weeks/3 is 13.6 weeks so with the LMP date at the end of your 13th week- you are 1/3 of the way through your pregnancy.  You can take away 2-3 days for each trimester if you believe that 40 weeks is spot on for gestation.  That would still but you at least half way through your 13th week- so for 1st timers my final answer is 14 weeks- for 2+ timers 13 weeks- for peace of mind 12 weeks- HAHA


I think also trimesters are a loosey goosey way of compartmentalizing stages of pregnancy.  I think we hold onto it because there are studies that say- you will have less nausea, you are less likely to miscarry your risk goes from 15-10% to less than 3%



that's all- as you can see I over analyze things 

post #7 of 11
2ss...lol...too many numbers for me smile.gif. it makes sense though. the 2nd trimester is still a few weeks away for me.
post #8 of 11


Originally Posted by Bena View Post

Not soon enough, in my opinion!!!



post #9 of 11
Thread Starter 

2SS, I love it! I am thinking along the same lines as you: if pregnancy is divided into thirds starting from actual conception, 14 weeks seems like a logical place to think of the first trimester changing over to the second. However, since dividing a pregnancy into trimesters is artificial - as you say - we aren't looking for precision anyway, and it can really be any time.


So, I think I'm going to go with the majority from the above poll: come 13 weeks, I will begin enjoying my "second trimester"! Woohoo!

post #10 of 11

lol.gif If we're going by how we feel I already feel second trimester-ish!


Nausea is gone, libido is back, and I'm not dragging my feet around all day because I'm exhausted (just lazy ;) )

post #11 of 11

2ss- I LOVE your over-analyzing!

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