Okay, so my periods fluctiate about every three months or so... that said they average about 29 days long. So it stands to reason that I should take the shortest cycle into consideration too when I try to find O. Right?
That's what I did So we've been BDing like crazy people for three days, just to cover the bases. Day before last I could still feel my cervix and no EWCM... Yesterday I didn't have any OPK's (mine were expired... guess I should have checked on that ehhh..) But my cervix was really high, I could barely reach it maybe tmi, and I had EWCM. I was stoked as I thought ooooh this is what I was waiting for. Well this morning, since I ran out to get some OPK's last evening, I POAS and still neg.
So if I O'd yesterday would it still show up on the OPK today... or shall I assume that I haven't O'd or had LH surge quite yet and keep testing and BDing?

How fast does it start and stop? I feel so stupid for asking, but I know you all can help me out.
P