excited about weight loss after baby

I'm 38 weeks and on Monday had gained a total of 12 pounds. Today I was weighed at the dr and lost 5 pounds. According to my dr and everyone else, that's normal for the end of pregnancy. So now my total weight gain is only 7 pounds! 😳.. I'm so excited to see how much I lose just by giving birth lol. There's at least 20-25 pounds of baby, placenta, fluid and uterus in there. I'm hoping I leave the hospital at my pre pregnancy weight or less. I'm really hoping to lose 100 pounds by the end of 2017 and it seems like baby is gonna get me off to a good start. 😊