Help please - when to start clomid?

Hey all

I am meant to start clomid double dose (100mg) day 2-6 cycle

I had slight spotting yesterday ... and today is more but not red red blood yet.

Would I class today as day 1? Or is day 1 once I get a full flow 🤷🏼‍♀️🤷🏼‍♀️?? X