What is CD 1??

Heather

I have PCOS and going to be on my 4th round of clomid. What do you consider cd 1? I have spotting for several days before and full on flow. I don’t want to mess up this round because I am getting my first ovulation scan on cd 13. I have heard heavy spotting is considered period and also that it is not. Also the spotting is often brown. Thanks for any advice!

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