Heavy CM before AF???

Mia • 35yrs old. Married. Dog Mom. Baby boy - Jan 2019! PCOS. Irregular cycles. TTC for baby #2 🙏🏽
My period is supposed to be due in 3 days and I'm having a lot of CM for the past 4-5 days - it's Egg white mostly. 
We have been TTC and I'm taking metformin, B12, and prenatal. Is this normal before AF or is it an early pregnancy symptom. This is very unusual for me since Ive never had this much CM before AF arrives.

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