The embryo already starts to be fed through the placenta with oxygen, fats, amino acids and sugars. The brain and the spine are the first to be formed out of a little stripe down the back, called the neural tube, then the heart, in the shape of a little cylinder beating irregularly.
Your baby is now between 2-3 mm, about the size of a petit poi.
Time to speak to the midwifery department of your local practice or hospital and let them know the news.