http://healthlifesuccess.com - The third and the final trimester is usually the most exciting one. A woman actually feels the signs of presence of a being inside her which are more prominent than during any other trimester. The third trimester begins at the end of 27 weeks or your second trimester. The mothers usually start preparing everything in this trimester and are super eager to know their due dates however, the doctor keeps them waiting till the date is super near. This is because due date depends upon numerous factors and if you’ve been pregnant before, your other pregnancies might last a shorter period of time than this one.