I intended to fast on the Ninth of Muharram and set an alarm to wake up before dawn to drink water. I woke up, drank, and waited for the dawn call to prayer, but it turned out that the call had been made and I did not notice the alarm. What is the ruling on my fast? Knowing that I had the intention to fast beforehand, but the mistake was unintentional, what is the ruling? Should I continue my fast or break it? Is my intention to fast valid or not?