Aih, I know how stressful itu sia, especially when your period is always punctual macam tu! Delayed period dengan negative UPT boleh jadi many things, stress, hormonal changes, weight fluctuations, or even thyroid issues, so kena go see your doctor to rule things out and get proper blood test if needed lah. A few of my mum friends went through this and turned out it was just stress from work or family stuff, but better get checked to be sure and put your mind at ease! Sending you strength, mama.