There are many reasons you might miss a period. Simple things such as stress or exercising too much can cause a missed period and many girls are irregular during the first few years of menstruating. But if you've missed a few periods, be sure to see your healthcare provider.
Courts usually find probable cause when there is a reasonable basis for believing that a crime may have been committed (for an arrest) or when evidence of the crime is present in the place to be searched (for a search).
A sufficient cause (see book)? In contrast, is a condition that more or less guarantees the effect in question. For example; pleading guilty to some criminal charge is a sufficient cause for being convicted . It is also possible to be convicted through a trial as well, but pleading guilty is sufficient.