I experienced my earliest symptom the night before my BFP. I was getting ready to go out to dinner & a huge hot flash hit me. I felt feverish & even asked MH to feel my forehead. I took my temp as well, but it was within normal range.
In the 1st year & a half of us trying, we did the whole 9 yards. Preseed, temping, OPK's, dietary changes...you name it (Oh, even mucinex because I never got EWCM). Frustration finally caused us to say "fluck it."
The month I got KU, we just happened to have sex in my fertile window. Nothing extra.
Disclaimer:: In NO way am I trying to promote the annoying "just stop trying!" advice. This was just my experience in my TTC journey, which is different for everyone.