Letrozole for PCOS

Mesa

So, I’m supposed to start my second round of Letrozole, 2.5mg cd3-7. I started spotting last night a little before 9:00 p.m., into a full af today. Would last night be considered cd1? Or today? I don’t usually start late at night, so I’m super confused about when I need to take the Letrozole! Help a girl out. 😩😅