If you share your _public_ key of your hardware wallet, someone can check on blockchain.info that there's a pending transaction or not (or you can do that yourself too, just copy your public key to the search bar of blockchain.info).
Usually transactions sent with a low fee are pendig for days and after they are deleted from the mempool (the place where the transactions are gathering and waiting to be confirmed, the miners are selecting the tranactions with the highest fees, so a transaction with a low fee are usually at the bottom of the mempool)
If you can find anything about your transaction, you can check the fee too.
If you can somehow provide a bit more information, someone will help to find out what had happened, that's for sure