BBT dip and implantation please

Can someone look at my chart and tell what you think?

Ok so I’m on first round of Femara. Weird opk peak results for 5 days. Felt I ovulated earlier than this app but bc of positive opk results it pushed it back until negative which can be off bc higher levels of LH.

I feel there was a dip bc of implantation on my chart I also had cramps and now feel some pressure my lower pelvic/groin area.

What do you think? When did I ovulate? Could that be a dip for implantation? When is the earliest I should test? I’ve got 6 pregnancy tests.