The embryo is what will develop into your baby.

The inner group of cells will become the embryo.

A blastocyst is made up of an inner group of cells with an outer shell.

During this time, it divides to form a ball of cells called a blastocyst.

The zygote spends the next few days traveling down the fallopian tube.

Half the DNA comes from the mother's egg and half from the father's sperm.

The zygote contains all of the genetic information (DNA) needed to become a baby.

The combined sperm and egg is called a zygote. When the single sperm enters the egg, conception occurs.

A single sperm and the mother's egg cell meet in the fallopian tube.

The strongest sperm will travel through the cervix (the opening of the womb, or uterus), and into the fallopian tubes.

During intercourse, sperm enters the vagina after the man ejaculates.

This is when you are most likely to conceive if you have unprotected intercourse.

During the end of the second week, an egg is released from an ovary.

The first week of pregnancy starts with the first day of a woman's menstrual period.

A normal gestation lasts anywhere from 37 to 42 weeks. This is when your body is preparing for a baby. This means that during weeks 1 and 2 of pregnancy, a woman is not yet pregnant. Because it's impossible to know exactly when conception occurs, gestational age is measured from the first day of the mother's last menstrual cycle to the current date. Gestation is the period of time between conception and birth when a baby grows and develops inside the mother's womb.

Actual 12 week fetus