i usually go by the months not weeks it would be week 13 i guess because there is 4 weeks in a month and you got 4/8/12 so your 12 wks now so it should have started at 12 weekss or it will start at 13 weeks
What is the length of the first, second and third trimesters?
The length of the trimesters is often a source of confusion. The word trimester means 'three months'. Three periods of three months each, gives pregnancy a beginning, a middle and an end period.
These periods match the developmental stages to divide up a pregnancy.
•Beginning: From LMP to 12 weeks the embryo develops all the major organs, becomes a fetus, and the placenta takes over control.
•Middle: From 12 weeks to 27 weeks the fetus continues developing and reaches viability.
•End: From 27 weeks on the fetus finishes development and prepares for delivery.
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