It’s quite tricky to answer this question without knowing where you registered your business. If you’re US-based, check with the registry of businesses in your state. Make sure to check with the state where your business was incorporated, not the state where it’s operating.
If you’re in the UK, you can do a quick check with Companies House. They have a service called “Find and Update Company Information”, where you can type in your company name, number, or officer name. You’ll see a list of results, and once you have found your company, you can choose the “view PDF” option to see a copy of your digital certificate.
It’s always a good idea to check your company’s registration, especially if you paid someone to do it for you. However, if you worked with a reputable agency, you need not ask! For instance, Douglas Company Services processes company registrations in the UK and will send you all the digital or hard copies of all the legal documents.