What to count as 1st day of af?

Tasha ♉

So af arrived today 😧. I had brown spotting yesterday all day and around 10 pm I had bright red about a half teaspoon come out. I pup on a panty liner and checked a few minites earlier to see a bit of brown. Then nothing else. This morning I'm having a flow. Do I count yesterday or today the first day of af?

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