On Clomid can you ovulate after CD21

Jamie • Married and TTC for 4 years! Have an 11 and 7 year old! ❤️ both adopted, hoping for a little one soon 👶🏽
My first round I ovulated on CD16 
My second round I didn't at all (or so my doctor said based on my progesterone test) 
My third round (now) I'm on CD17 and my ovulation test are negative still but seem to be getting darker, just wondering if I could ovulate after cd20 and what days have you other ladies ovulated on? Thanks! 

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