The most exciting part is that you will complete your second trimester and enter into your third trimester by the end of this week. This also indicates that the honeymoon period of your pregnancy is getting over and you would be up for some new unpleasant pregnancy symptoms during the final phase. Here is what happens during this week of your pregnancy: Frequent bouts of constipation: As your uterus stretches out more it also exerts pressure on the colon making constipation inevitable for some expectant mothers. The flip-side is that if you don t take adequate measures to combat the