Need some advice??

Right, On the 20th June I was getting some brown discharge for 3 days on and off then on the 23rd I had blood for 3 days so do I count day 1 on the 20th or 23rd, just wanted to know coz I took clomid on the 24th as day 2 to 6 but if the 20th was day one I have taken clomid 5-9 then also if the 20th was day one I should go for day 21 blood test today if I count 23th as day 1 it will be Friday day 21 so confusing I know sorry girls 🙈🙈