Does this look like an implantation dip on my BBT chart? 5DPO

[aspen_darling]

at 5 DPO my BBT dropped below my coverline, but the next day it went back up & has been increasing since then. I always heard mixed information about when implantation occurs. Some say 6-12 DPO
others say 7-13. is it possible that this dip on my chart is an implantation dip? & if it is, how soon can I expect a BFP?