Hello! This is my first month charting and my temps have been very regular and I'm waiting to O (currently on CD 16). This morning I had a big dip in temp. I thought it could be a pre-O dip, but my OPK tests today are still negative (very close, but not quite as dark as the control line).
My question is...those of you who notice a pre-O dip, is it generally the day before ovulation or can it be a couple days prior?
Thanks!