at this stage, it looks like a tadpole, it is during 2nd month that an intensive development of all organs and systems of the fetus starts. the brain develops faster than other organs. the embryo's head is one third of the whole body. the tiny hearts start beating. cartilaginous tissue is being by bone tissue. the length now is 20mm and weight is 8grams.
Human chorionic gonadotropin or human chorionic gonadotrophin (hCG) is a glycoprotein hormone produced in pregnancy that is made by the developing embryo after conception and later by the syncytiotrophoblast (part of the placenta).[1] Its role is to prevent the disintegration of the corpus luteum of the ovary and thereby maintain progesterone production that is critical for a pregnancy in humans. hCG may have additional functions; for instance, it is thought that hCG affects the immune tolerance of the pregnancy. Early pregnancy testing, in general, is based on the detection or measurement of hCG. Because hCG is produced also by some kinds of tumor, hCG is an important tumor marker especially (with clinical significance) in Gestational trophoblastic disease,[2] but it is not known whether this production is a contributing cause or an effect of tumorigenesis. - source from wikipedia.
Basically, when you are pregnant, the doctor will base on hCG level to confirm you are pregnant. The level of hCG may be measured in the blood or urine, and the level of hCG will increase tremendously through out the pregnancy period.
