I was obsessed just a few months ago. I was checking my CM daily (lovely!), temping, and recording it all on Fertility Friend. So I knew at all times exactly what CD I was on, exactly when I (thought) had iced, and exactly when ERTD was due.
One of the reasons to do this was to time my Day 21 test on the right day - I still haven't done that, so I do need to keep track a bit to get that right (I've had 2 tests with poor results which I think were on the wrong day each time).
I was drinking grapefruit juice in the 2 weeks prior to icing, and eating pineapple for a week after. I avoided alcohol completely during the TWOT and stressed about it if we went out for a night out.
At the time of being obsessed, I did wonder how anyone could ever not know where they were in their cycle, or how I would ever go back to JSing. Those women who say they didn't know they were pg for weeks because they had lost track of when their period was due, or those who said they fell pg just by not trying were a TOTAL mystery to me. I'm a control freak and a scientist, and I thought my obsession was just an inevitable result of my personality type.
And then, I just..... stopped. It was around the time that I applied for new job and I thought it prob best to not try too hard at the mo, just until I get established in the job. I stopped temping, and put away the Fertility Friend. And magically, the obsession has died away a bit. I no longer know exactly which CD I'm on, and I don't get annoyed with DP if we don't JS on the right days. No more arguments when he falls asleep and won't shag me on the days when I say he has to attractive
It's a relief. A weight off the shoulders.
Now I'm not saying I won't go back to obsessing in a few month's time when we start trying again in earnest. And I'd recommend temping and checking of CM to get an idea of your cycle, I really learned a lot. But don't let it take over your life, and don't let it ruin your sex life.
I'm the most obsessive control freak going. If I can be chilled out about it, anyone can. 