Ay, alam ko yan, super frustrating talaga 'pag ganyan! Two months delayed with symptoms pero negative PTs, honestly, kelangan mo na talaga mag-consult with your OB kasi could be maraming reasons (hormonal imbalance, stress, even the vitamins C affecting your cycle), at hindi lang PT ang magsasagot dito. One of my mum friends had something similar at it turned out thyroid issue, kaya better safe na mag-bloodwork para malaman mo talaga kung ano ang nangyayari sa katawan mo instead of guessing pa lang.