I'm not doing everyday, as much as I'd like too. I remember going for fertility treatments and DH sa was great. Dr told us we can't have too much sex. So we did like crazy. Every 12 hours for days, etc. When we went in for our IUI a few weeks later, she was shocked to see his count had really dropped. . . I think we obviously overdid it!!! ;-)
So, I never really have a plan until cd 11 or so. I just go with the flow until then. I know when I am ovulating, so I'm not afraid I'm going to miss it. I usually ov between cd15-18.
In the past 8 months of ttc, I've done every 24, every 36, and every 48 hours. Last month I did odd cd. 11, 13, 15, 17, and threw in 18 for good measure, lol. This is how I got my daughter.
This month I decided to hold off for a few days. So we bd on cd11, then skipped to 14, and tonight will be 16. I'm sure I'll hit at least 18 if not 17 and 19 too, hehehe.