Conception simply refers to the start of pregnancy. Conception is often used to describe a process known as fertilization. Once a girl reaches her puberty stage, she begins to show several sexual characteristics. At this point, she can be impregnated if fertilization occurs. The coming together of the ovum and sperm to form a zygote is usually referred to as the beginning of pregnancy or fertilization.
Gestation is the period of time, starting from the time of conception to the time the baby will be delivered. During this period, a fetus will witness a series of physical developments in her mother's womb until it is born or delivered. The gestation period for humans is usually nine months or 42 weeks. During gestation, there are three main stages i.e., first, second, and third trimesters. Each stage represents a certain developmental stage of the fetus, and for each stage, there are symptoms that a pregnant woman will experience.