It could be an bowel/bladder infection. You would suffer from pressure in your lower tummy area if you were pregnant, but only in the later stages. I had sharp pain under my stomach area a few months ago and I couldn't use the bathroom without feeling like something was stabbing me there. It turned out I had an bad infection and had to go for an ultra sound. It's best to go to the doctor and get it checked out :-)
you can also have a sis on your overesAbdomen starts to feel like sharp stabbing pains and cramps?
It may the beging of a stomach virus.Why am I getting sharp stomach pains?