Ay, nakaka-worry talaga pag ganyan no, pero maraming reasons why cycles can be delayed, stress, hormonal changes, diet, exercise, or even just your body doing its thing, lalo na kung consistently negative ang tests mo. I'd really suggest consulting with your OB to rule out anything else and get peace of mind, kasi kahit negative ang pregnancy test, important malaman kung ano talaga ang nangyayari sa body mo. You're doing the right thing by checking pa lang, at hinding-hindi ka mag-isa sa concern na ito, maraming moms have been there! Keep taking care of yourself, and once you get answers from your doctor, everything will make sense na. You've got this!