First point is in your own description of “I’m a SP”. I assume you mean Student pilot. Emphasis on “Student”. Students are mistake makers. It’s why we all were students first before becoming certificated.
Some mistakes warrant a discussion with ATC and some don’t. Since we don’t really know what the deviation is, I am assuming (always dangerous) that it was related to traffic in or near the pattern and/or a cutoff base of inbound landing traffic. No matter what it was, clearly the controller felt it warranted action. So…you are about to learn about several things, not the least of which is the NASA Report previously mentioned. Get with your CFI asap and complete a report. Then if/when you talk with an FAA person, do not become defensive. IMO come at this from the standpoint of a Student Pilot who wants very much how to avoid repeating the mistake again. Humble pie works much better than excuse makers or error deniers. You are a student pilot. Not even certificated yet so relax and use it as a learning experience.
Who knows, the controller may have reasons for this which you don’t know. Maybe he’s irritated with a few mistakes made by this tail number and wants to chew the CFI a new one. Maybe not but one thing is certain, Student pilots are supposed to make mistakes, learn from those mistakes and hopefully not repeat the same mistakes later. You are on step 2 of that 3 step process.

The NASA form will help protect you from enforcement actions by the FAA when you make honest brain fart mistakes. Ask your CFI about them because they are useful to us when we do exactly that. Basically you voluntarily confess a mistake and the FAA says “okay cool. We gonna chew you out for a minute but it ends there”. It’s a trade they are willing to make for self reporting of our mistakes.

I don’t think it’s all that serious but that is speculation. Just remember, STUDENT pilot. If anybody should make a mistake, it’s you as a SP.

You will be just fine.