clomid and ovulation question

Kristen
Hey all! I am on my first cycle of clomid, I O already every month on my own around cd 18/19. Doctor said he wants it closer to cd 14 and clomid should help. I am on cd 13 and still have an empty circle on my clearblue advanced.. did taking clomid mess up anyone's ovulation if they were ovulating on their own already? I hate to take it if it's not going to make a difference .