VFL and BBT drop

Barbie

Today at 9 DPO I see a vfl on a hpt, however my bbt dropped below the coverline. At this point, the dip can't be an implantation one since I've been seeing a vvvvfl since yesterday. Does this indicate a chemical?

Don't mind the Glow O predictor. It's not correct since I definitely ovulated earlier than it's prediction.