Feeling hungry and full at the same time?


I'm 17 weeks and a ftm. Usually at night I'll feel hungry but at the same time I feel bloated and full? I'll eat but I can only have small amounts because the bloated feeling becomes quite uncomfortable/painful and then I start to feel sick because I haven't eaten enough. I have to eat a little bit, then wait another 15-20 minutes before resuming eating. Is this normal?