I'm getting good at this guessing stuff

For dinner tonight I had a bowl of homeade chicken noodle soup. It has two different kinds of noodles/pasta. I had NO idea how many carbs it had, so i thought to myself, "well pasta is usually high in carbs. I'll start out with 3 units because i know it has atleast has 36 g of carbs. I'll have a cup of milk, so add 13g of carbs. 36 plus 13 equals 49g of carbs. So I'll give myself 4 units of humalog" Well i'm either a genius or just getting really good at guessing becasue 2 hours later I was 110. I was SOO proud of myself. And my dinner was quite good. Very tasty!!!