I've been charting for 3 months (temps, CM, CBEFM and this month some OPKs). I felt pretty confident that I Oed on CD27 this month, but when I put my 3dpo temp in this morning and FF plotted my coverline, it said I Oed on CD25!! Has anyone else ever had FF be wrong?
Bwahahaha. FF has been wrong so many times it's not even funny - back when I was active in the charting to avoid pregnancy threads on WC and CC a few years back we never trusted them and always ran any interpretations by a few other gals and our own knowledge of the rules. Especially if your temps and CM aren't textbook-perfect they tend to err.
O.k., thanks ladies! Someone suggested that I use the 'temperature corrector' to see if that changed anything, which it didn't, but it did give me the idea to play around with the data a bit. As soon as I deleted the +OPK on CD25, my O date shifted to CD27 as I thought. I definitely trust the CBEFM more than the OPKs since it measures LH + estrogen. I think my +OPK on CD25 was the beginning of my LH surge, but the estrogen got picked up the following morning. I guess I'll find out if I'm right in about 10 days!