I Woke Up This Morning With A Slight Tenderness In

I woke up this morning with a slight tenderness in my belly button. It's been like this throughout the day but never really caused a lot of pain. If I were to stretch in a certain way or bend over, I would feel it. I've been feeling a bit fatigued in the evening time but I was just thinking because I didn't eat all that much today. No real fever or anything. I Did not do all that much today before work. Ate a little, fed the dogs, and watched movies. I'm not sure if if was from something I ate or what I've done recently but not knowing what caused it scares me.