Day 21 - Counting counting counting

I borrowed mom's calculator this morning. If I am at day 21 of possible puppies and they only grow for 63 days...doesn't that mean that I would be 1/3 of the done already assuming there are little munchkins in me??? If so....what I to know is

WHERE'S THE FOOD!!! Don't pregnant women get to eat more and more and more and more and more?????