BBT dip sign of implantation?

Kristen • 28 years old and a married mom of three, 11 year old son, 2.5 year old and 10 month old daughters! I am a breastfeeding, babywearing, bedsharing mama! 😂
I had I pretty significant BBT dip today. 4 or 5 dpo. Could that be implantation or is it too early?