Measuring flow with cup?

Melflower🌻 • 🌻Married // Mom 💙; ttc#2

I’m pretty sure what I’m having is just spotting (very dark brown) and there was barely anything in the cup after 12 hours of wearing. It started 2 days before expected af and has only lasted two days so not sure if I count that as a light flow or spotting 🤷🏻‍♀️

What would you do?