Early signs of pregnancy to delay the menstrual cycle leads increase basal temperature from the time of ovulation, ie in the second half of the menstrual cycle of women. To determine this feature, you need several days to measure body temperature in the rectum.
This should be done in the morning, immediately after waking up and not getting out of bed - it is important for reliability. Basal temperature during pregnancy consistently above 37 degrees, usually it is in the range 37-37,2, but in some cases can be raised up to 38 degrees.
Occurs is because the body upon the occurrence of conception increases levels of the hormone progesterone, which affect the raising of temperature characteristics.
However, the increased basal temperature is maintained only during the first two weeks after conception, or rather, in the future temperature of nothing says. When the placenta begins to function fully, the temperature should recover. If not, then either something wrong with the pregnancy or the temperature increase was not associated with the onset of pregnancy.