If this egg is not fertilized, your hormone levels will drop, signaling to your body that it is time to shed the lining that built up
uterus. This is what causes your period
During pregnancy, your body is completely focused on providing for your baby. Your brain sends signals to your ovaries to stop the menstrual cycle in order to give your baby the proper environment to grow. As a result, instead of dropping, your hormone levels will continue to rise for the next nine months.