Speeding ticket

It’s the first day of school and I was running late to cheer. I got pulled over because I was going 39 in what I thought was a 35, but it was a school zone at the time making it 20. I have a court date and am so unbelievably nervous. I just wasn’t thinking, and can’t believe I did that but I did. Has anyone had something similar happen or have any idea on what they’ll give me in court?