heartburn, feeling full after a small meal

I am currently 6th week pregnant. Since week 5, I have been experiencing heartburn, slow digestion, appetite not been very good. Feel full after a small meal. Is it normal? Because is not like this in my first pregnancy. I went to consult the doctor, the doctor say is due to pregnancy hormones. I worried it might be some underlying conditions like stomach ulcer. But at this stage, is not recommended for me to do endoscopy.