Can clomid change your ovulation date the month you stop? Or is my clear blue wrong?

Melissa • Daughter 12/1/2016 ♥️ 32 weeker ToF PA MAPCAs ♥️ pregnant with #2 🌈 baby ♥️ MC 10/3/2018 👼

I normally ovulate on my own around CD 21 ish identified on cheepie opks. I took clomid the past two months and I ovulated CD 19 then CD 17. Well this month I stopped clomid and went with clear blue digital advance. I figured I would ovulate around CD 21 again but I just got a peak at CD 15??? Even earlier than last month on the clomid? Is this normal for stopping clomid? Or could the cb digital be wrong??

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