Yes it depends on how long of a cycle you have. On your profile it says you have a cycle of 35 days. So you're due for AF on the 21st of this month? So right now or the last couple days....you should maybe experiencing some EW or water CM because you are around or maybe just finished ovulation. I have about the same length of a cycle and I ovulate between the 14th-16th day of my cycle. Then my luteal phase is about 14-16 days long.
For you I would say to start BDing starting on CD10 and go every other day until CD24...you never know. You could ovulate early or late unless you're really regular. Look up deanna's plan. That may help you.
Well it depends on how long your cycle is and how much money you want to spend on OPKs. I have a 29 day cycle but since I ovulated at different times in the last two cycles I start the day after AF leaves. Let me know how long your cycle is and I will try to help.