The home test provides a fairly high accuracy. But he only gives a yes or no answer to the question of whether the production of hCG in the body of a woman has increased. The test confirms that the pregnancy has come, but does not show its term - because it does not determine how much the hormone level has increased. Laboratory diagnostics of blood is more accurate. A blood test quantifies the concentration of hCG, which allows you to determine approximately how many days the pregnancy lasts.
It is possible to clarify whether there is a pregnancy and determine its duration during an ultrasound scan. With the help of ultrasound, a 5 mm fetal egg can be detected, approximately at the 4-5th week of pregnancy, immediately after a missed period. Shows ultrasound and some pathologies, in particular ectopic pregnancy.
It is important to understand that ultrasound does not always give an accurate answer to the question of whether you are pregnant. With a low resolution of the equipment at the 3-4th week of pregnancy, the fetal egg can not be seen. Therefore, doctors recommend doing an ultrasound scan no earlier than 6-7 weeks of pregnancy. At this time, you can see the fetal egg and embryo, and hear its heartbeat.