They all seem to differ don't they...
I always used to O around day 16 and have a 28 day cycle which isn't too bad but I haven't had a normal cycle for about 18 months. Between being on Zoladex for 6 months last year then straight into IVF after my lap the only natural cycles I've had have been after a stim cycle so completely messed up to the point I don't even think I did O. I'll make sure I get luteal support this time!