Pain lower right abdomen when sit

Yetty

Hi, I am 22 weeks pregnant. Since yesterday, I am having this sharp pain at my right lower abdomen. The pain go on and off. When I went to work today, the pain comes more often especially when I am sitting. When I nap, the pain goes away. It will occur when I am sitting, standing and walking. Is it a normal thing? Or should I worry about it?