watermark VS indent VS VVFL??

I’m just trying to understand the difference in how these 3 things look like. I know that indent happens past the 3 minute mark and has no color and is usually grey but as for water mark and VVFL what does the difference look like? Because now I’m thinking my VVFL could be a water mark but I left my pee hit my test for only 5-6 seconds..

Hoping this also helps other woman too