Feeling ugh

So today I woke up fine and ready to go. When I got to work all of a sudden I have a sharp pain in my stomach like I need to throw up. Nothing is coming up but I feel super nauseas. It comes and goes but when it comes I feel like I'm about to puke. I couldn't even eat my oatmeal or drink my coffee. Any idea what this could be? Could it be an early sign that I'm pregnant?