Is my LLC legal?

The Secretary of State can be backlogged, so a 2 week wait isn't unusual. But your paperwork or check may not be right for some reason, so you need to wait to do business (and open a bank account, etc.), until you get certified Articles back. You can also check online, linked below, so see if your LLC is active.

You're best off consulting a business lawyer before your launch a product on the market. There are a lot of considerations in operating a retail business, including warranties, disclaimers, insurance, etc., and it sounds like you've already lost the opportunity to consult a lawyer about selecting a business name, trade name/trademark, domain name, advertising issues, etc. Look at all the people on Avvo who don't see a lawyer until AFTER the problem arises --it's not too late to to get the benefit of some good advice that can PREVENT problems from arising.

Disclaimer: Please note that this answer does not constitute legal advice, and should not be relied on, since each state has different laws, each situation is fact specific, and it is impossible to evaluate a legal problem without a comprehensive consultation and review of all the facts and documents at issue. This answer does not create an attorney-client relationship.