Ay, ganyan talaga sometimes, mare, stress, hormonal changes, kahit irregular cycle lang ang dami ng reasons why delayed period pero negative pa rin ang PT. A few of my mum friends experienced that before, and honestly, mas safe na mag-follow up sa doctor na lang para sure, especially if this is unusual for you kasi they can check what's really going on. Two weeks is quite a while na, so better to get clarity from your OB rather than worry pa more, no? Sending you good thoughts!