Hi, Last month I had a short monthly period and it was delayed by 4 days. Right now I feel that there s something moving in my stomach everytime I sneeze and the size of my stomach is bigger than unusual. I never experienced this before and I always have a flat belly. I tried 3 times of using the pregnancy test to check if I am pregnant but it s always show negative result. What do you think is the reason of this feeling? Thanks!