Such a low bbt dip

Nicole • ✨TTC #1 since 10/1/18✨👼🏻

Not sure why I would have such a low dip on my bbt. My last months ovulation I’m pin pointing to CD 15 or 16 which was Dec 20th or 21st. AF was from Jan3-8th do you think it’s possible I could be ovulating early I know I have to take a few more temps to see if that’s the case just wondering if it’s possible or anyone has experienced an ovulation dip so early? My suspected ovulation this month is CD 15 or 16 again.