late period

I'm supposed to be starting my period today but I haven't had anything yet. I usually start in the early morning like around 5 and 6 even 7 o'clock in the morning but yet nothing happened yet and I don't feel anything I don't feel no cramping or no diahrea lol as the usual and its already 12 so I'm kind of concerned because my period is always on time and I always know my dates but I'm not very sure anymore maybe I should wait or maybe I'm just tripping but i also don't have protected sex with my partner so who knows