Flex cup + flow tracking?

Hi ladies! I was just wondering, if the ladies who have the flex cup (or any menstrual cup tbh), how you track the heaviness of your flow using it? I always used tampons and pads so I could tell a lot easier, but I’ve found that with the cup it’s really hard for me to determine how light or heavy it is, unless there’s like a drop in there at the end of the day ya know? I’ve always kept track of my flow during my cycle but I’ve just kind of been guessing since i got the cup. And with the flex cup being black it’s harder to see how much blood is really in there😅