Had some brown spotting yesterday but didn’t turn into my period? Possible implantation bleeding?

I have PCOS with my 2nd cycle after birth control. First period just came full on and bright red. This time around my boobs have gotten swollen (used to be a sign my period was coming pre-birth control) but I’ve only had this brown spotting for a day and it never progressed into my period.

Please tell me what you think this means! I’m not confident about when/if I ovulated.

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