Every pregnancy is different with my son I was always eating but with this one I'm never hungry I still make myself eat some. I would suggest talking to your dr about it they will be able to tell you if your ok or if you need to take another action. Good luck and congrats on your little one
I have a small loss of appetite too & I'm 22 weeks, throughout my pregnancy I've only gained 5 pounds but in my first trimester I lost a couple pounds.
Well I know in my first trimester I lost a bit of weight because of nausea, but if its still going on after 3 months I would go in to the ER or to your doctors office, sounds like you would be at least dehydrated