Is it normal for your LH to fluctuate before ovulation

I began LH testing a day after AF and had darker opk lines than I do now, 6 days later. I should ovulate in 3-5 days but my lines have been basically staying the same. Today I decided to start testing twice per day instead of once so I don’t miss my peak. Took a test around noon and got a lighter line than the tests I’ve been taking around 3pm daily. Is this normal? Only my 2nd month using opks. Also should add that I check cm as well, and everything seems normal so far, no EWCM yet. Thanks

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