(Closed) When Does Third Trimester Officially Begin?

posted 7 years ago in Pregnancy
Post # 3
2399 posts
Buzzing bee
  • Wedding: October 2012

I thought it was 7 months?

Post # 5
1577 posts
Bumble bee

I always heard that it was between 27 and 28, but it depends on how they are calculating it. Some split 40 weeks into thirds and some split 42 weeks into thirds, and others don’t have equal thirds at all, haha.

Post # 6
1486 posts
Bumble bee
  • Wedding: October 2010

My OB calculated it at 28 weeks, which, incidentally is when my 2x a month visits started.

Post # 7
1621 posts
Bumble bee
  • Wedding: September 2012

28 weeks.

Post # 9
177 posts
Blushing bee
  • Wedding: September 2010

@PrncssDva:  I’m 27 weeks and 2 days. I think we deserve to say we’re in our 3rd tri. we’re getting there!

Post # 11
7900 posts
Bumble Beekeeper
  • Wedding: March 2012 - Pelican Grand Beach Resort

My OB went with 28 weeks, so that’s what I went with. I find it hideously annoying that there are so many different systems and that most give you 12 weeks for Tri 1 (of which you aren’t even pregnant for 2 of them), 12 for Tri 3, so then 16 for Tri 2… what?!

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