TMI is this fertile CM ? Last cycle was 55 days.

Iesha • Married 💍 30. Angel baby 01.25.19 👼🏼 - 🌈💙July 24th 2020 ♥️ 🤰🏻w/ twins 💚💚

I’m on CD 15 and I went to the washroom and wiped and I saw this on the tissue. I’m very surprised because I feel like this is super close to just finishing my period?