As the other ladies have said, your body automatically gives bubby the good stuff, so no worries there at all. My bubby was measuring 5 days under my dates at my midway scan, but she told me they have a weeks leeway either side for error, so our bub was within the 'normal' range.

Also they can't say this early on if that means bub is going to be small or skinny, babies grow at all different speeds and your bub may not put his insulation layer until later in the pregnancy. My OB wont tell me how big bubby is looking until the last few weeks.

Don't worry yourself at all, it really sounds just normal, same as mine. Take care and enjoy the 2nd half of your pregnancy