Even though this week counts as week 1 of pregnancy, you are not actually pregnant yet
This week counts as part of your 40 weeks of pregnancy, but you aren't officially pregnant until week 3 as conception occurs about two weeks after your period.
Your egg has left the ovary
You are now ovulating and your egg will begin to travel through the fallopian tubes.
Your baby's sex is already decided
Your egg has now been fertilised and the first steps in your baby's development have begun. Whether you are having a boy or a girl is now decided.
Your baby is called an embryo at this stage
Until around week 8 of pregnancy the medical term for your baby is an embryo. After this they will be referred to as a foetus.
Your baby is now called an embryo and is already growing rapidly. The placenta is formed and will nourish your baby for the remainder of your pregnancy by passing nutrients to them through the umbilical cord.
This phase of growth is crucial for your baby's healthy development. If you aren't already, then start taking a 400 microgram folic acid supplement as this will be needed for the development of your baby's brain and spinal cord which occurs very early on in pregnancy.
Your baby will double in size by the end of the week
You may not feel like you are pregnant yet but that doesn't mean that there isn't a lot happening! Even at this early stage your baby is developing rapidly and the neural tube is already forming.
Your baby's heart will soon start to beat
Already, your baby is receiving nutrition and oxygen through your placenta. This will continue to pass them nutrients from you and oxygen throughout the next 8 months.
Baby's lungs, liver and pancreas are all being formed
You may be feeling tired at the moment and it is no wonder with all that's going on inside you. Your body is getting used to lots of physical changes and your baby is growing rapidly.
Your baby's heart is beating twice as fast as yours
An adult's heart usually beats around 60 - 100 times per minute but your baby's is already beating 150 beats per minute - this will even increase further to 170 in a couple of weeks.
Your little future genius already has a functioning and rapidly growing brain!
Your baby's head will appear larger than their body as their brain grows rapidly now. When they are born, around 25% of their adult brain will already be formed. This will increase to about 80% by the time they are 3 years old.
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