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.
A trimester is a third of a typical pregnancy. So if a pregnancy is 9 months, a trimester is 3 months long. The first and second trimester each have 13 weeks, while the third trimester has 14 weeks. Determining how far along you are in a pregnancy can get confusing.