My cycle is usually 30 days long so according to the little table in the instructions I should start using the OPKs around CD14, but I'm wondering whether it might pay to do it sooner anyway, just to be sure...!

Also, i think i remember reading somewhere that 2pm was the best time to do them? What time have you got a +ve OPK results? Would it be beneficial to test twice a day?

I'm only so paranoid because I've only used OPKs for 2 previous cycles and neither time did they detect O.

Oh and I'm taking clomid - would that affect?