Does the temp drop mean I’m out?

Helena

I’m currently CD26/day 13 dpo

Had very sore boobs for a few days now. Had a dip on day 10 dpo which I was praying was an implantation dip.

Today I had a 0.3c dip on my bbt 😩

I assume then this means AF is on its way again and im out? Is the dip significant enough?