I'm a minor and I was raped, I do I tell my mom?

My 16th birthday is only a few weeks away. I'm not even 16. A little over a month ago I was raped at my high schools football game. I feel so filthy and disgusted with myself all the time and I have had my period or so I thought but I've read there's still a possibility I could be pregnant? I'm terrified mall the time. What if my mom doesn't believe me what if she hates me for what happened? What if she tells my dad? What if they try to make me press charges? I didn't even know him. I'm scared I'll see him at school but I don't even know who he is. Please help give me some advice