Happy Easter all [bugrin] (up again early for me! 5.19am and again at 6.50am with Bella wanting a wee and poo respectively, at least she told us!!)
Aaaaaaaanyway, have found the following re trimesters:
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.
When does the first trimester end or third trimester begin?
Does it really matter exactly when you are out of the first trimester or start the third trimester? No. When the trimesters start and end depends on who you ask, which book you read or what website you visit. Most health care providers actually talk about your pregnancy in weeks, rather than months or trimesters.