My age is 31 years. My lmp was 27 december 2022. The next periods were on 23 january 2023. Cycle length is 26-28 days. It didn’t come so I waited but did pregnancy test on 7 th february because it was getting too late. The test also came negative. Now its 15 th of february and still haven’t got periods. My cycle has always been regular and my lifestyle is also very healthy. What is the cause of delayed period’s ?