Yes, it's completely normal to have appetite changes during pregnancy.
Many women don't gain any weight during the first trimester, and that can be completely normal. During later trimesters, the growing baby can put a lot of pressure on your stomach and make it feel smaller (it IS smaller!) so that you may want to eat less, but more often.
As long as your weight is healthy and your diet is healthy, you probably don't have anything to worry about!
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