Well, danger averted - I found an extra stash of digis in my medicine cabinet, so I decided to use one today. It was negative.
That's interesting about our cycles, Indira - I wonder if it has something to do with our reaction to the phases of the moon? I'm just disappointed I have so much EWCM this month - last month I hardly had any and thought it was a good sign that the diet was changing my chemistry.
Z - I normally get EWCM and have a soft, open cervix for a few days before I O, so I'm not completely surprised by the -, but thanks for the info about how SP might change my cycle - I think I'll test 3 times a day with an IC and once a day with a digi from here on out to make sure I don't miss an early O.