No weight gain!!

Is anyone else dealing with losing weight still and not gaining anything back?!? If so how are you dealing with it? I will be 30 weeks on Friday when I got pregnant I was 157 was so sick and dropped down to 143 and I started putting on a little then stopped! I have been 147 since January!! Idk what to do anymore I haven’t been able to keep anything down for the last 3 days 😭 I take nausea medicine and medicine for heartburn cause that’s usually what makes me sick. Also I’m in soooooooo much pain my lower back. My legs. My stomach physically hurts and been having lots of pressure 😩 any advice?