3rd trimester weight loss. is this normal?

is it normal to have no appetite. I literally FORGET to eat throughout the day! I am not trying to diet, but I know I am back to first trimester habits. instead of morning sickness, it's terrible GERD. my stomach is so squished that there's no room for how I used to eat in the second trimester. idc if I lose, I just want my son to gain. he is doing great at last prenatal check-up, & I'm wondering if this is normal! I feel really bad but I'm just not hungry anymore And my appetite is awful again.. I also worry about my potential supply. I eat lots of oatmeal, fruits, veggies, whole grains but I worry it's not enough.