Hi Wishstar, pinkyrose...
Did you try to monitor your cervical mucus? When I was TTC #1, I only monitor CM, never use OPK. Took me only 2 cycles to strike!
I heard that if you are using lubricant, should use those sperm friendly ones, like preseed or conceive plus..not sure whether this helps or not though...
Think overall just try to relax and not too gan chiong. Some mummies I know use OPK, monitor CM, count days, BBT etc..basically all the methods...and never strike. But when they decide to stop all these, relax liao, then baby comes!