Is spotting considered CD 1?

🎀GirlMom 01/2023🎀

I'm currently on my period and started having dark brown blood on Thursday. Well on Friday I had blood, not much but enough for a tampon.

I'm asking this because my OB prescribed clomid 100mg to start on CD 3. I started the clomid on Sunday and will be taking my last pill on Thursday!

Should it be fine taking the clomid on Sunday?