Is it possible to get a negative opk in the morning but a positive in the afternoon?

I took an ovulation test early this morning and the line wasnt even close to being as dark as it should be to be positive. When I went pee a little bit ago I noticed a lot of CM on my underwear (TMI sorry) and when I wiped a good amount of clear super stretchy CM was on the toilet paper. Could I possibly be ovulating even though the opk this morning was negative?

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