I have a really bad stomach ache for over an hour now. I had a salad at lunch, but I have a few prawns in it. Do you think it could be that. And if so I have done something stupid. It was a tesco salad, ready made. Another one of the girls at work is pregnant, and she has been eating anything all the way through. And this was one of the things she eats. Baby is moving about and kicking, my stomach has been a hard rock for about a day now, so it doesn't feel any different, it just feels like a bad stomach ache.