If you get a positive OPK do you BD on that day or the next day??? For the past two months I've been getting a positive OPK on CD 14 and BD on CD 12,14, and 16. (obgyn said to BD every other day.) and still BFN both months.  Do you think I'm doing the right thing or should I BD on CD 11, 13,15 and 17 instead?? Any help or recommendations??? Thanks