If you had any points you would know about it. If you've been caught again then once you return the driver nomination (which you must do) the police are likely to offer you a fixed penalty, at which point you'll have the option of accepting 3 points, or pleading not guilty and going to court (but in the absence of a defence there's no point as the court will likely convict you and give you the points anyway).
Unless you're convicted in your absence you would know about any points you have, they don't just magically appear without you knowing about it. This would only happen if for some reason you missed all the paperwork and the case went to court without you knowing about it, but as you seem to have received the paperwork this seems unlikely.
