That depends on how healthy you are. Of course, there is nothing wrong in getting a regular check up done just to make sure that there is nothing wrong with you. You can simply do this at home and keep a record, and you can show it to your doctor during your monthly visits. If you have abnormal blood pressure levels, then it is better to get it checked at least once in two weeks. There are several digital monitors that are available that you can get to check your blood pressure levels at home as well. Hope that helps.