Will I go to jail for this?

Okay, so I locked myself out of my house one night and couldn't get in. So I walked to my sisters house and I climbed into the window just to go to sleep for the night. Being my sister, and having told me if I ever needed somewhere, I could always go to her I went over. She woke up when I was climbing in and called the police. Even though she told them not to press charges the police are and im being charged with Burglary. I had a pocket knife on me just in case and apparently that says I had the intent to steal.. So what do you guys think?