Anyone else??

21 weeks and just over the last week I’ve noticed a loss of appetite, feeling of abdominal fullness, heart burn.. I’m not really nauseous.. I just don’t wanna eat. this hasn’t been my whole pregnancy and I’ve gained about 12 pounds this pregnancy.. but I just wanna know if this is normal to not feel hungry? What to expect says I should be having an excessive appetite.... Is this a result of my intestines being moved around from my growing uterus? Today has been really bad and I’m just not hungry. I’ve had a small amount of chicken, potato chips, a slice of cheese and a banana over the course of the whole day.. I feel like I’m gonna pop. Please tell me I’m not the only one.