Floating Poop??

So for about 6 months now, every poop I take floats. Every day. This has never happened to me before. The only change was switching from Yaz to a generic version and then I went off birth control entirely. Has anyone else had anything like this? 
I've had blood tests, stool samples and everything has come back normal. I'm going to a GI specialist soon and I'm scared they'll want me to get a colonoscopy. It's like my body is over-producing gas. 
I don't understand 😰😭😭😭😭😭😭
Edit - Thanks everyone! It's not high fat, but might be from fiber - I eat a lot of spinach?? The ultrasound showed my gallbladder is normal too. Blah. I am lactose intolerant, but I don't usually consume any dairy during the week and only occasionally on weekends (thanks Lactaid!)