Can checking your blood pressure too many times in a row/day be dangerous, like release an embolism?

No: A normal person with normal blood vessels can check her blood pressure several times a day without concern about causing any problems. She cannot release a blood clot unless there is already a blood clot sitting in her blood vessel (which a normal person does not have). Also, people who worry a lot about their blood pressure numbers often cause their numbers to increase due to their own worrying.