12 weeks isn't the start of 2nd. Trimester?

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jacksonbabies's picture
Joined: 09/12/12
Posts: 34
12 weeks isn't the start of 2nd. Trimester?

So, my doctor told me that 12 weeks is no longer the start of 2nd. Trimester it's now 14weeks. When did that start? When I got pregnant in 2007 , 12 weeks pregnant was the start of 2nd trimester....I have had the same doctor (same OBGYN) :confused:

NutMeg4189's picture
Joined: 09/26/11
Posts: 524

I don't know. I don't even remember what they told me the last time I was pregnant. I just did some reading to figure it out. A lot of sites or sources say 13 and a lot say 14. I went with 14 weeks as the start of my 2nd trimester, and that was when I was able to breathe a small sigh of relief that we made it Smile

Joined: 08/24/05
Posts: 316

I don't think anyone can really agree on it tbh. I've read 12, 13, 14 and some say that the END of the 14th week is the end of the 1st trimester. It's all over the place with differing opinions.

Joined: 05/15/08
Posts: 413

I think it depends on how you are calculating the pregnancy 14wks from lmp is 12wks from conception. If you're a stickler for math, it should be 13wks, because that is the closest to an actual third of 40wks.