Ahh, well that makes sense, LOL. I put your O at CD19 (10dpo) based on those temps that you have in there. The temps are too low to support an earlier O day. Fallback rise at 2dpo and then dips at 7 and 10dpo, which might indicate implantation as the dips are right on track. But like Satya said, the dips are caused by a surge in eostrogen not implantation as commonly believed (is just a coincidence that they happen at the same time.
Although....
estrogen surge from a second ovulation
this is incorrect as you can't O twice in one cycle (and if you did it would be within 24 hours). The dips in your temp Nadine aren't below the coverline anyway, so I wouldn't be too worried (and I think FF has put your coverline too high either way). As for getting an O line, you can do a manual one of the day you think you O'd. You go into "ovulation dector" tuning/overide. It gives you a blue line and you can put in a manual coverline for temps if you want to (I think you put 1/10 above the highest low temp before your O surge). The coverline that FF gave you based on those fake temps will stuff up your future chart averages. But hopefully it won't matter as you'll be pregnant, LOL.

Klee - well that's good to hear!! Thanks for sharing!

Best of luck ladies!! Hope to hear of some BFPs soon!