CD11 too early for positive ovulation test?

C

So last week I took Letrozole (5mg) to help with ovulation. I’ve been tracking OPKs since CD8 with all ⭕️ then this morning I got a peak. Can I get a

peak without any high fertile days? Is it normal to ovulate so early? I took a cheap ovulation stick at this same time and it still showed a negative but darker than the others. Could clear blue be showing a false positive? I’ve been super crampy since yesterday could they be ovulation cramps??