2nd tri issues

20w6d. Most of the time I have little appetite, i.e., a sandwich for one meal, 2-3 meals a day. Rarely take my prenatal vitamins as the pill has been difficult to swallow recently. So, I'm trying to get prenatal gummies instead. I also have few other medications due to rheumatoid arthritis. Started to wake up a few times in the middle of the night coughing due to dry and scratchy throat. And sometimes pain in my upper back/chest. I guess this is heartburn? I just recovered from covid 2 weeks ago. Now I'm just worried about baby's growth as my bump looks small..my FA scan is still 2 weeks from now. But I have started to feel baby's kicks, or like a punch from inside.