So, I guess i don't need to warn you that this may be a TMI question

My cycles are around 32 days (thanks to clomid) and every cycle on CD18 I have quite painful ovulation pains. I never have EWCM, infact I have very little CM until after ovulation. I can't say for sure if i ovulate on CD18 because i don't temp. To explain this a little easier.....

CD18 - strong pains that last a few hours
CD19 - no CM
CD20 - no CM
CD21 - A lot of creamy white CM lasting up to a week

The white creamy CM is always 2 days after suspected ovulation. Does that mean i am ovulating on CD18 or does it mean i am ovulating on CD20?
What are your thoughts?