Nationalism is the term historians used to characterize the modern sense of national political autonomy and self-determination from the late 18th century onwards. For example, German nationalism emerged as a reaction against Napoleonic control of Germany as the Confederation of the Rhine around 1805â14.
1 Work out the length of your average menstrual cycle. Day one is the first day of the menstrual period and the last day is the day before the next period begins.  Ovulation happens about two weeks before the next expected period. So if your average menstrual cycle is 28 days, you ovulate around day 14.
Add up the number of days, divide by 4 months, and you get an average of 30 days. With that number, you can predict the first day of your next period when adding 30 days to the last. So, if my last period started on February 2, I add 30 days and come up with March 4 for the first day of my next period.