Sore nipples only for 3 days?

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I have PCOS and irregular cycles but have consistently gotten them 28-40 days apart for the last 3 months. Im due to get AF tomorrow according to Glow (not always accurate). I had faintly sore nipples for 3 days that are completely gone today. Today is CD 32. What could that mean?

Tested yesterday with an amazon cheapie and not FMU and it was negative.

I symptom spot every month and have been let down for the last 2 years so who knows 🤷🏻‍♀️