term ante partum

Prenatal period

Is the time from conception to birth

Fertilization

Is the union of sperm cell and egg cell

Gestation period

It begins when the woman had her last menstrual period until birth of the baby

The three period of pregnancy

First trimester second trimester third trimester

Conceptus

is defined as the developing offspring (a fertilized egg that continues to divide implantation)

Embryonic period

Starts from fertilization through eight week

Fetus

Refers to the offspring from week nine through birth