If you both have a good sex drive then personally with a 28 day cycle I'd start BDing on CD6. Try doing it every other day until CD18. If you do your OPKs as well and make sure you BD more when you start getting positives and until a couple of days after you think you O'd then you'll have covered it, all being well.
We fell 2nd month by doing that (minus OPKs - I've never bothered with them) and we did it every day from CD8 - CD17 and fell 1st month.
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