best advice for bbt is to make sure you do it same time every morning before getting up for a wee, talking, or anything, i know this sounds a bit wierd but best place to get accurate temp reading is vaginally, so just pop the thermometer up there (not too far though lol), and make a note of the temp, once you have done that you can go back to sleep or whatever, but its best to make sure you do it same time every morning, if you do this every day (not during period) you can plot a graph ther is a good site called fertility friend which you can use to enter your details daily and they plot the graph for you, you can back this graph up by testing for the hormone that is present when you are about to ovulate with the ovulation prediction tests, these are best used mid afternoon when the levels have had chance to get in to your system and best done when you havent had a drink for about two hours, so your wee is not diluted, just pee into a clean cup and dip the stick in and you should be able to see the lines getting dark when you are ready to ovulate, sounds simple doesnt it lol x