About the size of a strawberry seed, about 2mm.
Around 15 days after fertilisation the first signs of your baby appear in the form of the primitive streak. This streak is made up of three layers of cells, each layer of cells will develop into a particular part of your baby. The top layer becomes the spinal cord, brain, and nervous system, the middle layer becomes bones and muscles, the heart and blood system, and the bottom layer becomes the lungs, the stomach, the small and large intestines, and the urinary system.
Your levels of hCG are increasing, and you may notice that the symptoms that you would usually expect leading up to your period such as tender breasts, heightened sense of smell, and tiredness are exacerbated.
Now you know that you are expecting a baby, you can start to think about who you might tell and when. A lot of people will wait until the end of the first trimester however you may want to tell someone close to you who will be able to support you during the early weeks. This may become particularly important if you suffer with morning sickness or if you have a miscarriage, which occurs in 1 in 4 pregnancies. If you are affected by a miscarriage, it is important that you seek professional support if you are impacted by it to look after your mental health.
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