No appetite at 22 wks!

I keep reading and hearing that at this stage of my pregnancy I should have an increased appetite however I am never hungry could easily go through the day without eating but obviously am having to force myself which then makes me feel nauseous even more than I already do! At the beginning of my pregnancy I also lost a little weight ..... Does anyone else have this problem or had this problem as I am concerned my baby may not be getting everything he needs (although I am also taking pregnacare, a pregnancy vitamin daily  and iron tablets)