Frustrated by weight loss. ):

I'm 17+1 and have lost 13lbs. Gained 3 then lost the 3 again. Still suffering from nausea and vomiting. Most days I can't keep anything down. I feel like my dr is blowing me off. He keeps saying you'll put on weight soon and leaves it at that. I looked like I was starting to "show" then when I lost the 3lbs again I'm back to being skinny. My family keeps saying things about "when you ever get big" and at this point I feel like I'm never going to. This is my second and with my first I started to round out at 16weeks. Now at 17 weeks with my second I could pull off a two piece and no one would ever know.