The due date of every woman is usually calculated from the first day of her last menstrual period and after two weeks conception happens.
This is a case when you are really considered to be pregnant. There are millions of sperm swim upstream on the quest to fertile an egg and only one sperm successfully penetrates the egg. This sperm forms the genetic makeup which will determine the sex of the baby, the physical appearance, its intelligence, character and personality.
You can take a closer look at the ovulation process and all the details about it at the video down below: