Stomach burning/tightening sensation

Hey all, I will be 29 weeks on Wednesday. For the last week I have started experiencing a burning feeling on my skin at the top of my stomach and straight down to my belly button. It’s accompanied by pain and tightening of my stomach and makes me super uncomfortable. It seems to only happen if I do certain movements at home or when I am at work. I finally got an appt to see my OB to discuss what could be going on as initially I was hoping it was just stretching/growing pains but now it’s affecting my work. It seems to go away for the most part over night when I lay down and don’t do anything but at only 29 weeks I was hoping to keep working until September 3rd. Has anyone ever experienced anything like this?