While you should monitor your blood pressure to watch for signs of hypertension, doing so too frequently can actually exacerbate the problem by causing anxiety and raising your blood pressure. Home blood pressure monitors can be easy to use and inexpensive. According to Harvard Medical School,  people watching their pressure at home should ask their doctor for their recommendations on frequency -- whether this is once a week or once a month -- and note that the best time to perform a check is early in the morning.