clomid 100 mg

M3
Hi frnds
I have PCOS and I never get period on my own. I took regestrone to induce my period
I took clomid 100 mg 5-9 days. This is my first cycle.I did not start with 50mg.Today I am cd 38. No period and no BFP. I got solid smiley on clearblue ovulation test on cd 19. 
Can anyone tell what is the reason?