I have a really weird question, it's kind of hard to explain the feeling/pain. There is one spot on…

I have a really weird question, it's kind of hard to explain the feeling/pain. There is one spot on my belly that I can't touch at all today, it feels like a really bad bruise but there's no visible marks. If my belly bumps into the counter or anything it sends like a really sharp pain thru my stomach... Is this just normal because my belly is so stretched out? I don't know what it could be... I'm hoping I didn't get bit by anything but like I said, there's no visible marks of any kind..