When I was sick during my pregnancy, a few of us in my mum group found it helped to eat small portions more frequently throughout the day rather than trying to finish a full meal, so maybe try that and see if it helps. Staying hydrated is really important too, so sip on water or some warm soup in between. Since you are pregnant and worried about baby, it might be good to check with your gynae or PD just to be safe, especially if the loss of appetite goes on for more than a day or two. Hope you feel better soon, take good care of yourself lah.