I need some advice!! :)

Hi all so i started my 4th round of clomid first time at 100mgs may 2nd... Ive had cycles on the 50mg come as late as 36 days generally its between 28-32 now im on CD 40 with a BPN on May 30th... This is unusual because i always ovulated and had a period on the 50 so you would think i would on the 100... Im confused and unsure of what steps to take next... Might have to do the provera :S