What's wrong?

I'm gonna go to the doctor and I know I'm not pregnant so this isn't a pitty me post or dumb girl that isn't using common sense. I noticed I looked like I was bloated (for 3 days!) And it was out of no where. it wasn't food I ate, I didn't have to use the restroom or pass ags I tried a bunch. I did take a pregnancy test but I knew it would be negative like it was. My ovulation was this same week. this pic was taken 5 days ago and my stomach will look like this every few days and stay. I'm not pushing out on the pictures I even took pics with me pushing my stomach out just for that reason. But I guess my question is has anyone else experienced this? it isn't painful just weird. and like I said I habe a dr.appt. just wanted to see if anyone else might know what it is?

bottom is me pushing my stomach out

usually I have a flat stomach, it isn't just my size.