Hi Katy, I don't mean to state the obvious, and please forgive me if you already know all this and are an expert, but are you following the full principles of charting?
Taking your basal (resting) temperature is an excellent way of tracking what happens during your cycle, but only if you are doing it correctly i.e. every day, first thing in the morning (after at least three hours sleep), before you get out of bed and using a basal thermometer. You then plot the data out as a graph, and look for patterns, which (all being well) is usually a lower temperature before ovulation and then a rise the day after ovulation which is sustained until you bleed. Variation in temperatures from day to day is normal, and to be expected, which is why the pattern over a month is most significant. To fully chart, temperatures are also combined with observing cervical fluid to help pin-point ovulation, and the optional approach of checking cervix position as well.
It takes a good few months of doing this to learn your own pattern and to know what is 'normal' for you. Taking your temperature during the day just gives you the normal temperature that humans are generally at, which is 37degC.
A good book to read is 'Taking Charge of Your Fertility' by Toni Weschler, and the website 'Fertility Friend' is very popular for helping to plot your temperatures. They also send you a course of how to do it by email when you sign up. I'm sure there is a lot of info on the internet as well.
Again, sorry if I am telling you stuff you already know, but you mention that you have never temped before. There is a thread on here full of people who are charting to help with TTC, its called 'Charters Anonymous', I think.
All the best for TTC.