Which hormone is known as the pregnancy hormone?

Select the correct option describing gonadotropin activity in a normal pregnant female.

Foetal ejection reflex in human female is induced by

What is the correct sequence of events in the formation of an offspring from a zygote?

After one month of pregnancy,the embryo's $A$ is formed. By the end of the $B$ month of pregnancy,the foetus develops limbs and digits. By the end of $C$,most of the major organ systems are formed,for example,the limbs and external genital organs are well-developed. By the end of $D$,the body is covered with fine hair,eyelids separate,and eyelashes are formed. Here $A$ and $D$ refer to:

Identify the stages $A$ and $B$; and what is the correct labelling of $C$ and $D$ in the process of human embryonic development?