Your Pregnancy: Weeks 1-4

Pregnancy week by week: You are one week pregnant


 

Your Body

Your pregnancy is calculated not from the day your baby was conceived, but from the first day of your last menstrual period. During this first week, the blood-rich lining of the uterus is released and leaves your body over the next three to five days. At the same time, your body begins to prepare for the possibility of pregnancy: already there is an egg ripening in one of your ovaries.

Have you been planning and preparing for a baby? Ideally, you are taking folic acid supplements (which help to prevent neural tube defects such as spina bifida) and eating well.

Baby’s World

You can already estimate your not-yet-conceived baby’s birthday! It will be roughly 40 weeks from the first day of your last period. Of course, that is based on a 28-day menstrual cycle, with conception happening right in the middle. If your cycles are typically longer or shorter, be sure to let your doctor or midwife know so that can be taken into account.

At some point in the next week or so, the rapidly-multiplying cells reach the size of about the head of a pin, and then divide into two parts. One part will become the placenta, providing nourishment for the baby as it grows, and the other half will become your baby.

The cells in the zygote continue to multiply rapidly: the placenta attaches itself to the wall of the uterus and the other half becomes a hollow ball. The baby’s heart and internal organs will develop in the middle of that ball.

Fun Fact

At the moment the sperm and egg join, all the genes are in place to determine many things about this baby: eye colour, hair colour and so much more. Your baby is a unique individual from the very beginning.

  Week 5

 

Written by Michele Holcomb and Teresa Pittman

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