Thanks Girls and Alan. Yeah it does feel like a bruise, so that is good to know that it is just my tummy swelling!!
I do tend to use my tummy muscles cause most of the time I am getting up to go to the toilet and am half asleep and forget. I have to remember that everything is changing in there and I have to be more careful. Thanks so much for the help. I feel alot better and convinced that stretching or swelling is all it is.