Ay, napakastressful yan talaga! Honestly, kahit negative ang PT, kung 28 days na kang late at regular ka normally, kailangan mo talaga mag-check up with your OB para malaman kung ano ang nangyari, could be hormonal imbalance, stress, or something else na kailangan i-rule out properly. One of my mum friends had a similar scare, tapos turned out stress lang dahil sa family problems, pero hindi rin immediately bumalik ang period niya agad. Don't wait na, mama, better safe than sorry, at ang OB lang talaga ang makakapag-confirm kung hindi pregnancy ang issue. Keep us posted!