Cup users! Help!

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This is my first cycle using a cup!

I’m been having trouble with leaks and putting it in right, but that’s a whole question for a different time!

I was wondering, how do you chart your flow?

The first 2 days I could tell were heavy based on how much was in the cup after only 5 hours, I think.

I’m on day 4 and it’s pretty hard to tell what’s going on in there!

Can the cup also make your period shorter?

Thanks!