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If you divide 40 weeks by 3 it's 13.3 weeks for each trimester so I went with 13 weeks but felt emotionally better after 12 weeks because developmentally of the reason Erica mentioned.
This is how I did it, I counted the beginning of the 13th week as the start of the 2nd though because it was easier to remember But, I am a "technical" person, so it was always 13.3 since tri is 3...lol!