Approximately 0.2mm, made up of around 300 cells. This is the diameter of the tip of a 0.2mm sewing needle.
The first two weeks after fertilisation are called the pre-embryonic period, weeks 2-8 are the embryonic period, and week 8 until birth are the foetal period. During the first week after fertilisation, in the first week of the pre-embryonic period, the zygote moves from the fallopian tubes into the uterus and develops into a blastocyst. If you would like more detail on this early stage of development, see the blog post “Early Foetal Development”.
You may start to notice symptoms such as tender breasts, a change in appetite, or a change in your normal mood. You may also experience no symptoms at this early stage – everyone is unique in what they start to experience and when.
It is likely that you will be unaware of your pregnancy at this time. If you are actively conceiving, then maintaining health and wellness continue to be important during this time. Make sure you are looking after your physical, mental, and emotional health. If you are actively conceiving, you may want to consider not smoking or drinking as both of these can impact of your baby’s development. The National Organisation for FASD (Foetal Alcohol Spectrum Disorder) states that there is no known safe level of alcohol consumption in pregnancy. Alcohol can damage the brain, nervous system, and other organs in your baby’s body, so it is best to stop drinking as soon as you find out that you are pregnant, or from the moment you make the decision to conceive.
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