wet panties!

I don't know if I'm overthinking this. I have dealt with discharge through out my entire pregnancy. Always clear, no smell. I'm concerned that it seems to be getting worse. It's a lot and I don't know if this is normal. Today I went to the bathroom and there was a spot the size of a fist. How do I know it's not my waters leaking? I have a doctors appt on Wednesday and plan on mentioning to my doctor, but last time they kinda just brushed it off and said it was normal. Just looking to see if anyone else is experiencing the same thing.