Clomid intake question

Mariana • I`m a 31 year old vegan woman based in Western Europe.
So my doctor told me to take Clomid on days 5-9 of my cycle, but I don't know if I'm calculating it right. I've been spotting for 4 days, the barest, almost not there pink, today was the first day with light bleeding. So what I want to know is, should I consider day one to be today or this past Friday? I'm beyond confused!