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TMI—need help though.

If this started last night and my AF was supposed to start in 2 days. Would this be considered CD 1 or would CD 1 start when I actually need to use a tampon or something? I’m TTC but I’ve been having a hard time figuring out when my CD 1 is. My last 3 AF have been light and to where I haven’t really been even needing tampons or pads. Just a panty liner if that.