did u get pregnant with Clomid?

dmoon
Dear all,
This is my history 
3 Clomid cycles failed
1 Letrozole cycle failed
4th Clomid cycle -got a positive opk on cd 15 and got my periods on cd 30
5th Clomid cycle - cd18 today -no positive opk till today
My question is it possible to ovulate late in different Clomid cycles?