Im 18 my last piriod was 2nd may on my ovulation i made 5days blood and browning now im 7days late piriod and negative pregnancy what happen?

Irregular periods?: Do you often have irregular periods? That's a common reason for what you describe. If you are on birth control pills, that would be uncommon to have late period good to avoid unprotected sex - always use a condom, and consider pills if you are having sex. Good idea to check urine pregnancy test in another 1 week if still no period.