If your menstrual period is usually normal, but you suddenly experience a delay in your menstrual period and feel hot, most of the time it may be caused by pregnancy. After ovulation, the basal body temperature will rise, usually around 37℃, and the body will feel hot. If you are not pregnant, the corpus luteum will shrink at the end of the period, that is, around the 28th day of the period, and the basal body temperature will drop, and then you will have your period. If you are pregnant, your basal body temperature will continue to rise under the action of progesterone, and your body will feel hot, so it is advisable to collect morning urine for early pregnancy test to know whether you are pregnant or not, and it is recommended that you don’t drink too much water in the two hours before you collect morning urine so as not to cause dilution of the urine and lead to a false-negative result.