I'm feeling the same as you.
This is the first month that I charted everything an the lh surge seemed later than the others. Our bding was more in line with the lh surge and it didn't work out for us.
I had a lot of uncertainty because I had elevated temps from being sick around the o date. I had a small (10 degree) temp dip on dec 30 followed by a temp rise to 98.0 on dec 31 and then 99, 99.5 and 98. I had ewcm from dec 28 to jan 1. But it went away mid-day jan 1 after a sleepless night. My lh was positive on dec 31 but barely (i had to drink fluids but I tried not to dilute my urine too much). Then it was positive on jan 1 and jan 2.
At first, ff predicted dec 30 as the o date after the 99.5 temp day. But when my temp went back down, it said that it couldn't detect a date. Our bded on dec 29, dec 31, and jan1. I now suspect that I did o on dec 30 because my temps before af were around 98 and I did start af 14 days later. Today my temp is 97.59. But why didn't the opk pick up an lh surge until after this date? I wonder if the more expensive tests are more accurate. I think this month, i'll try bding each day I have ewcm.