I can't see a progression with my OPKs; I got a positive on CD18 or something, but CD17's OPK may aswell have been 10 days away for the strength of the line. I think next cycle, if we don't get a BFP this time, we'll need to BD every other day, like you say, from CD14 or something. trouble is with two kids (one of which is up every 1-2hrs for feeds during the evening/night) and with a husband who's on shifts, it's hard to fid the time.
I can't help thinking the BDing we did this month wasnt enough. We BD the day I ovulated (but that morning I'd got a second positive OPK, and we BD'd an hour later), and the following day (6pm) aswell. Who knows...
last month was a crazy cycle (ovulated on CD6 and had a 38 day cycle). this month I ovulated on CD18 or so, and I should have around 32 day cycle, which is more "normal" for me. At least I know to expect my ovulation earlier in the month so can aim better for next time.