oral is most accurate.

rectal will read higher. subtract a degree.

auxillery, add a degree.
* if using mercury thermometer. most digital have their own settings or charts.

if your mercury thermometer is old, it may not be reading correctly.

going out in the heat can raise you basel body temperature, as can high humidty.

you may have gotten a slight case of food poisoning, which mose cases of diarhea or loose stools are. the temp may have been your body fighting off the bacteria.

laser thermometers are used to take your temp in your ear. fast and easy. they have little clear throw away guards, so they are sterile. i have a digital and the laser. laser is awesome to take a temp of a sleeping kid. they never know.