I never charted as such. I just worked out my approx O date based on my general cycle length (4-5ish weeks) and then tried to DTD every second day for about a week either side of that date. I figured it gave us the best chance of catching the egg. We were lucky that we got UTD very quickly doing this (all up 3 times in 5 cycles trying). That being said, if I were to do this for 3-4 cycles with no result then I'd probably start charting or similar.