Ay mama, ganyan talaga ang stress, parang ang haba ng antayan! Honestly, if you've been testing since late January and all came out negative, mas likely na delayed lang talaga ang period mo dahil sa stress or hormonal changes, kaya siguro okay na ang negative results mo. But since it's been a whole month plus na walang period, best to see your OB na para ma-check properly, they can do a blood test or ultrasound na mas accurate kaysa home PT, at makikita niya rin kung may ibang reason bakit delayed. Don't stress yourself more with the testing, ang dami na nyang PT, hehe, leave it to the doc na lang para ma-ease your mind for good.