Help, period is late

Cheynne
My period was supposed to come on the 8th of May. And still no period.  I usually have my periods at the middle of the month. Sometimes towards the end of the month. But I have cramps (mild ones). My boobs a little sore.  I sometimes feel  nauseated only when I don't eat. But I'm just trying to get an idea of what's going on. Can someone help me out