The monophasic signal of basal body temperature means no ovulation, while the biphasic type of basal body temperature means ovulation. Let’s first understand how the basal body temperature is determined. Every morning when we wake up, we cannot engage in any activity, go to the toilet, brush our teeth and wash our face, and the temperature measured at this time is also the basal body temperature. At the time of ovulation, our basal body temperature starts to rise slowly, with an increase of 0.3-0.5°C. At this time, our body temperature is maintained between 36.7 and 37.2°C. The increase in body temperature means that we are now in the ovulation period. If we draw a graph of this phase, the basal body temperature is a biphasic graph. On the contrary, if the basal body temperature is not elevated during ovulation, the graph depicted is a monophasic graph of the basal body temperature, which represents the graph of no ovulation.