Elevated Basal Temperature
After implantation occurs, the basal body temperature may rise up to about 1º F. Thus, if you find your basal temperature to be high for over 18 days continuously, without any apparent illness, you may be pregnant. A fertilized egg is implanted in the womb about 6 to 12 days after ovulation. This means it happens about 2 to 3 weeks before you miss a period. If this is what you experience, there are chances of you being pregnant.