Everyone is different, my cycle was about 31 days, and O at 20 days. I also know a lady that O either 1 or 2 days after AF finished, depending on which side she O from.
From my experience, temp charting is better then weeing on stick charting. Mainly because when i used the wee on stick method, i was testing based on teh 14 day theory, and i also got negatitive results. I got more dissapointed from this, because i started to think i would never see 2 little lines (i cant remember what brand i used). That depressed me more.