For the past three months, my periods have lasted only 2 days with minimal bleeding, whereas they usually last 4-5 days. Now, it has been one month since my last period, and I'm in the second month (starting from the 30th), and my periods still haven’t come. A doctor advised me to take the Regestrone 5mg, which I took, but my periods still haven’t started. What could be the issue, and what tests should I consider, given that I am not
pregnant?