Although your baby is nothing more than a teeny tiny group of cells right now, it doesn't mean there isn't a lot going on! Those cells are doubling, tripling, quadrupling quicker than you can say "blastocyst multiplication". They need a lot of energy to work so hard, but there's no placenta to feed them just yet. Instead, your baby is getting everything it needs from the thickly lined walls of your uterus, where it has begun to find a nice spot in which to embed itself.

The cells know exactly what they need to do and are already in the process of forming your baby's most vital organs; the brain and the heart. An abdominal ultrasound won't show anything at this time, but keen-eyed sonographers may be able to detect the beginning of the implantation process through a vaginal ultrasound.

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