Does clomid cause early ovulation?

A lot of people said to wait until using opks buuuttt I did what my doctor told me to do (sorry guys) took clomid cd5-9 and began per doctor, opks on cd 10, negative. Cd 11, negative. THIS MORNING cd 12- flashy smiling face. So technically it wouldn’t be a false positive/High, right? It’s not like I got it the day after my last pill. My glow “fertile week isn’t supposed to begin until Thursday-CD 15. What do you think?