The dobutamine stress echo test involves the injection of a medication called dobutamine while you are closely monitored. The medication stimulates your heart in a similar way as exercise. Important: If you have a pacemaker/defibrillator, it must be checked at Cleveland Clinic before your dobutamine stress echo test.
Your Baby During the Second Trimester. The second trimester is normally considered to be from the beginning of the fourth month to the end of the sixth month. This works out in weeks to start from about the thirteenth week of pregnancy.
With each new week during the second trimester, a new stage of pregnancy is experienced by the mother and developing fetus. During the second trimester, an expectant mother can expect a rapid increase in the size of the uterus. At the end of the trimester, a developing fetus will be approximately four times larger than it was at the end of the first trimester.