The key thing is that you can absolutely get fined for driving without active insurance, and the penalties vary significantly depending on where you live. In most US states, you're looking at fines ranging from a couple hundred to over a thousand dollars, plus potential license suspension, points on your record, and sometimes even jail time in repeat cases. The length of the lapse matters less than whether you were actually caught driving during that gap - a week is a week, and the law doesn't really care if it's seven days or seven months.
What probably saved you is that you didn't get pulled over. If a cop had stopped you during that uninsured week, you'd have faced whatever your state's penalties are (some are harsher than others), and your license could've been suspended immediately. You also would've been liable for any damages if you'd caused an accident, which is a financial nightmare since your insurance wouldn't cover it. Some states are stricter about this than others, so the actual consequences depend on your location.
Since this happened back in 2024 and you haven't mentioned getting a citation, you're probably in the clear. Going forward, just set a reminder a week or two before your policy expires so there's never a gap. Most insurers let you renew online in minutes, and it's way easier than dealing with the headache of driving uninsured.