there are 40 weeks in pregnancy.
so if you divide that into three trimesters, you get 13 1/3 weeks.
here's a free online calculator that will tell you when each of your trimesters ends as well as your due date, estimated date of conception, etc.
http://healthlink.mcw.edu/article/923526833.html
2007-01-02 03:40:37
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answer #1
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answered by EmLa 5
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The end of week 12 is the end of the first trimester
2007-01-02 11:47:11
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answer #2
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answered by Kristen B 2
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the 13th week ends the 1st trimester. Once you turn 13 weeks then you will be in your second trimester
2007-01-02 11:42:26
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answer #3
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answered by anneanderson85 2
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I believe the 12th week is the end of the first trimester.
2007-01-02 11:39:50
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answer #4
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answered by ? 6
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13
2007-01-02 11:38:39
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answer #5
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answered by mrchprpl_1979 2
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the 12th ends it and the 13th begins the second trimester.
2007-01-02 11:39:57
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answer #6
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answered by puppy love 6
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14th week begins the second trimester, so the first would end at week 13
2007-01-02 11:39:23
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answer #7
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answered by Mommy of 2 Boys 4
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I would think that as you are entering your 13th week, you have just completed your 1st trimester.
2007-01-02 11:39:18
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answer #8
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answered by B.Cakes 2
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the end of12th wweek ends 1st trimester
2007-01-02 11:44:02
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answer #9
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answered by brentheather13004 2
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The end of the 12th week.
2007-01-02 11:38:31
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answer #10
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answered by warriorbysword 2
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