I think the answer is technically no because you can have the eggwhite mucus on days you don't ovulate. I use the Creighton model for family planning and I track my fertility using the mucus. According to this model (I think others may do it differently) anything that is lubricative, stretches an inch, or is totally clear is considered "peak type" mucus. Supposedly the sperm can live in that stuff for days, and so it doesn't matter if you have sex on Tuesday and then ovulate on Thursday - you could still get pregnant if there was this good peak stuff going on...
at 4:18 PM on Feb. 7, 2011