How likely will my AP score be canceled for writing after time was called?

Can someone with experience share with me? I am so ooooo regretful and nervous now! The stupid graphing calculator was so slow, I was just waiting for the answer to come out(an integral), it took like30s to finally show the answer. The superviser called the time. We were supposed to go to the next section which is no calculator but the test was not ending yet. I just wrote down the final answer. She found me after the exam and said she would file an report to CB and asked for my signature and ap numbed. I didnt know that they are this strict. How likely will my score be canceled due to this? On some forums it says writing overtime is minor and will probably cause a delay only.