im sure i read somewhere you dont ovulate every month ? i'll have to double check could be wrong( PG hormones =memory loss lol) i did all that with my first, ov kits , thermometers, ect and it got to be more about the science and not the fun( looking back it was never fun anyway!) so with this one we never bothered as we had way more fun practising, i found that not stressing probably helped. I think if you really want to know if your ovulating and when then use the ov kits, its up too you, i'll try and find more info x