Eating

I'm almost 31 weeks and I don't get hungry very often and I just won't eat if I'm not hungry. This morning at 1am I had a bowl of soup and now it's 2pm and I still haven't ate anything else and I'm hardly hungry but might eat in the next 30 minutes. But basically I don't really eat a lot or often and people are telling me it's unhealthy. My doctor hasn't complained and my pregnancy is healthy even considering I've lost weight every time I get weighed at the doctor. But my baby is gaining weight and growing normal, I'm the only one that's losing weight.