What Could Cause Unexpected Light And Bloody Vaginal Discharge While Having Regular Menstrual Cycles?

Hi, i'm 20 years old, not married, and not sexually active, i missed my period this month, i had brown discharges for like 5 days, and like a very light period, that was like 13 days ago, today i had bloody discharges, not smelly or itchy, and i'm just so worried that it might be cancer, and i get my period every 35 days, when i had bloody discharges it was after 28 days from my previous period, please help me