Ay girl, nakaka-worry talaga yan especially pag first time mo pa lang! Pero if you've tested twice and both negative, kailangan mo talaga mag-check with your OB para ma-rule out kung ano talaga ang cause ng delay at palpitations mo, could be stress, hormonal imbalance, or something else entirely na kailangan i-address ng doctor. A few of my mum friends din naka-experience ng delayed period na negative pregnancy test, at most of the time it was just stress or thyroid stuff, pero importante talaga i-confirm with a professional para ma-ease your mind at ma-get proper treatment if needed.