hunger

I'm almost 28weeks pregnant and I'm never hungry I have to literally make myself eat or I won't actually eat anything at all through out the day and wen I do eat I end up feeling absolutely horrible and like I want to vomit is this happening to anyone else and if it is is it something really serious that I need to talk to my Dr about? im a ftm and I'm kinda getting nervous about it and my fiance keeps pestering me about eating and is getting worried too