I'm 19 too, and I went from 170 to 160.
Thanks. My doctor was really rushed and just told me to work on gaining weight. I have no idea how to do that haha. But that makes me feel better that others go through it too!
Yes it is very normal. My doctor told me up until your half way through your pregnancy you can loose as much weight as you want, once your over half way mark you have to start gaining. I was 168 when I found out I was pregnant and I'm 151 now.