Criminal trespassing charge?

I was at my friends house and her brother was drinking and decided to jump in the neighbors pool. Me and my friend tried to get him out of the pool and the neighbor turned on the lights and started yelling about how she called the cops and they would b here any second. The cops came and said we had criminal trespassing charges and the next day gave us papers saying when we had court. I am already on probation for an underage I got last year. My question is, should I plead not guilty since we were just trying to get my friends brother out of the neighbors pool? If so could we get in more trouble if they would find us guilty?