Good evening! Almost 38 weeks, the third day has been bothering me wit…

Good evening! Almost 38 weeks, the third day has been bothering me with an unpleasant sour taste in my mouth, I feel nauseous since morning, without any urge to vomit, and today it's three times that I have gastric juice when I suddenly bend over. I try eating small portions and not overeat. But all to no avail. Maybe someone had this or what can be taken so that it becomes easier?