Question on my weight gain/loss?

Chandra
Few facts, I'm 21, 1 child, and 9 1/2 weeks pregnant with my second. 5 foot 6inches and my pre pregnancy weight would fluctuate between 140-145. Jean size 9. I'm a pretty healthy size, but with this second pregnancy I've been SO sick. Lucky to keep down 1 meal a day, throwing up constantly and I actually got down to 137. That's almost 10 pounds down! I've been on nausea medicine for about 2 weeks and I'm up to 139 but that's it. I'm eating pretty healthy and regularly now and exercising about twice a week. I'm just still afraid my little bean isn't getting enough nutrition. My doctor doesn't seem too concerned with the weight loss. Am I overreacting? No real baby bump just bloat.