Well, first, it depends where you put the thermometer in. 
Second, most meat thermometer is not calibrated nicely at the low end (your body) temperature, so it can be inaccurate. Third, many meat thermometers have a fairly inaccurate for body temperature measurement. For a meat thermometer +/- 1 oF is considered pretty accurate for cooking, but a +/- 1 oF can be scary for fever measurement.
This one, for example, has a +/- 1.9 oF (essentially 2 oF)
"MORE ACCURATE: Habor Digital Kitchen Thermometers has Sensitive Sensor Chip and Thin Probe Tip, which control error range ±1.8℉.This is a very excellent performance! "
https://www.amazon.com/Habor-Instant-Read-Meat-Thermometer/dp/B01DISPQJ0/
"ACCURATE READING:GDEALER meat thermometer with temperature range of -58°F ~ 572°F (-50°C ~ 300°C), accurate to ±1℃（±2℉) between -50~200℃(-58℉~392℉),±2℃/℉ more than 200℃/392℉. "
https://www.amazon.com/GDEALER-Waterproof-Thermometer-Calibration-Function/dp/B077N9T555/
