menstrual cycle should be about 28 days. This means that there should be about 28 days from the. Before and Going to the Chelsea Mundae BasicsPregnancy Signs and. For the most part, the menstrual cycle occurs predictably and without problems.. Only two things can delay the start of
a period. Pregnancy and delayed ovulation.. the time when a woman's period starts is the same from cycle to cycle.. If pregnancy is not achieved, the endometrium is shed at the end of your monthly cycle, resulting in menstruation (or your 
period).. RESULTS: There was no significant difference in serum angiogenin levels during each phase of the menstrual cycle. The serum angiogenin levels
effective at preventing pregnancy when taken as directed.. The first day of your period is considered
your cycle.. Only two things can delay the start of a period. Pregnancy and delayed ovulation.. the time when
period starts is the same from cycle to cycle... want to avoid pregnancy, these information pages explain how the menstrual cycle. This is your period and is considered the beginning
of a new cycle.. Thus, to find out if period is 