Regular Cycle With PCOS / 4 Days Delayed

Hi po mga momsh, I'm 25yrs old. I was diagnosed with PCOS around a year ago but I never missed my period. Laging regular and on time if madelay man it would just be for 1 day. I used to have heavy period before until I tried to lose a bit of weight from 95kgs to 85kgs but now I've gained 2kgs po but I don't eat as much anymore. Ngayon po I'm 4days delayed and I don't feel anything at all aside from craving certain foods tyaka a bit of pain both sides of my hips and backache pero very faint lang dati kasi when I'm about to have my period sobrang in pain ko na, there are times i also felt nauseous whenever I see food. Nag PT po ako first day of missed pero negative naman po siya. Could I be pregnant?