Your temperature may not be accurate if you did not take it as soon as you woke up but it should not mess up your charting for this cycle (1).
Make sure to mark that day's temperature as a "Questionable Temp" in the Data section. By doing this, your questionable temperature will be displayed as a grey dot and will not be connected to your other temperatures on the chart.
This will essentially allow you to ignore the abnormal temperature while still keeping track of the overall temperature pattern.
1) Weschler, T. (2015). Taking Charge of Your Fertility: The Definitive Guide to Natural Birth Control, Pregnancy Achievement, and Reproductive Health. pg 74-75