I think it's too early to tell what kind of pattern your chart is taking. FF hasn't given a cover line yet or set the O date. If this helps, I had more than a few charts where my temperatures where really choppy - big peaks up and down especially when I first started charting. I did get one with a BFP, and that one had a fall back pattern. See pic.
Hang in there, hopefully in a few days you will get an O date from FF, and if not maybe you could try plugging in some lower temps before your fertile period?
FX'd for your BFP!!