you need to buy a bbt thermometer jet. most pharmacies ought to have them but I remember none of the ones around my area did and I ended up ordering one in (well the kindly pharmacist ordered one in for me). mine was $14.95. you need a special bbt thermo as they're sensitive enough to detect temps to 2 decimal places. you basically check your temps at the same time every day as soon as you wake up. like literally, open your eyes and get the thermo in yore gob. don't get up, go to the toilet etc. it needs to be your resting body temp. and it needs to have been after at least 3 hours of sleep (but if you toss and turn and have the odd crap nights sleep well what can you really do). so I set my alarm for 6am each morning (for work) and just temp when it goes off. if I snooze after then that's fine but it's basically my bbt alarm. you also need to temp on weekends so you'd need to set your alarm for the same time. I've slacked off temping lately but will start again from tomo. I'm on cd 9 now so will continue temping til I'm sure I've ovulated.