i accidentally went to obscene site?

[517]

i am in a big trouble. I was surfing for some University admission form information and after finishing with that i felt bored so i went to some jokes site(clicked on google link). It silently opened a popup in background showing obscene, inappropriate text and pictures. I immediately closed it before it could load any images when i realized it was being loaded. It was some sort of ad or popup. I went away without any thing like deleting history. It was my mom's phone with default android browser(Gingerbread)
It's been weeks now (i didn't even remember it) My useless workless evil sister show it to my mother and enjoying it. Now mom will tell dad. What should i do? I swear i didn't do any sin. please help. I don't even remember it exactly.I am 17 year old student.
For people saying it is not a big deal... it is a huge deal.I am seriously studying for getting into college and that devil(sister) is 21 year old and yet not in college. She tailord the whole story.. i watched her do it.. then i remembered it.This will disturb my studies if parents harass me for a thing that i DID NOT DO

[Akira]

Explain what happened?
It seems everyone is afraid of telling the truth these days. I wonder why..

[Mink]

The best thing is tell them the truth. Tell them what happened it was just an accident it can happen with anyone. So be honest and tell your parents. Good luck!

[Snow White]

its just a popup, stop stressing out, its no big deal.

[kamala]

dear these days many sites got popup ads which leads to more worst sites which you dont like to visit so its not your mistake just explain your parents about this ..

gud luck

[Aakash]

well first off just tell the truth bro !!!
Tell him what happened and all that stuff... It is however not likeable to be truth to your father since you're 17 unless you've always been a good boy all along he may forgive you.

The point is : tell 'em the truth !!
:-)