Period 2 days late

Hey I have been using this glow app for a month or 2. It’s been usually dead on about when my period starts. It is usually a day early or a day late.. but it’s been spot on.. it say I was supposed to get it the 5th but my period didn’t show.. I have gotten no cramping no sore boobs.. I just been extra defensive lately.. and it’s aggressive.. I have to calm myself done sometimes and I usually get extra bitchy when my period is on it’s way but I haven’t.. my boyfriend told me the other night my nipple area looks dark and I didn’t pay it no mind... I took 2 test they both came back negative. My stress levels hasn’t been high.. I haven’t really been stressing a lot lately because god always works it out for me.. my main concern has been food.. that’s my number one stress trigger...but I have been worried about it lately because something always happen where I have food in my house.. but now i am worried because my period is late