At some time during this week a very special event has taken place inside your body: your egg and your partner’s sperm have met in one of your fallopian tubes, and fertilization has occurred. For your egg to get to your fallopian tube (the ducts that join each one of your ovaries to your uterus) your egg has had to mature previously and later travel from the ovary to the meeting place.

Once in the fallopian tube, only one out of millions and millions of sperms sent by your partner will be the one to fertilize the egg. Twins are two eggs fertilized by different sperms and identical twins are one egg that is divided into two identical cells as soon as it is fertilized.

Fertilization occurs when your partner’s sperm penetrates the egg with its head and loses its tail. From that moment on, the egg is fertilized, and it is called a zygote. It then starts to divide very fast by two, by four, by eight and by sixteen cells. Thanks to this geometric progression in division, in a few weeks there will be hundreds of thousands of cells and in a few days millions of them.

The zygote, or fertilized egg continues on its journey down the fallopian tubes towards the uterus. Once it gets to the uterus it will be implanted on the wall, burying itself so that it starts generating the structures that will make its development possible during your pregnancy. All this process generates what is known as the pregnancy hormone, which the home pregnancy test will show in a few days.

Congratulations! You are going to have a baby!