Your baby now resembles a teeny tadpole (complete with a tiny tail) and is about the size of an orange seed. The circulatory (or blood) system, along with the heart, is the first part of that tiny body to be functional; and as your baby's heart starts to form, you may even be able to see it beating on an early ultrasound. Another part of your little tadpole that is under construction: the neural tube, which will eventually become your baby's brain and spinal cord.
You may begin noticing some pregnancy-related discomforts already - frequent urination, fatigue, breast tenderness and changes, nausea, excessive saliva, food cravings and aversions
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