Weight

I started off weighing 163lb. In the first trimester I lost 7lbs. I dropped to 156lb. Now at 23w I am 164lb. I never had morning sickness, but has severe nausea which made it quite difficult to eat. Now I feel week. I'm eating more. Not necessarily the healthiest I could be eating with my crazy cravings. Has anyone else lost weight in the first trimester then gained it back? My OBGYN says its normal but I'm just curious if anyone else has this issue and how they feel...