If you have a digital receipt for your Turnitin submission you can relax, even if learn.gold is saying you haven't submitted yet. (There is an issue with Turnitin and Learn.gold that causes this misleading message).
If you have misplaced the email receipt from Turnitin, you should be able to download it - we have some help with this here:
https://azgold01a0101.gold.cdl.cosector.com/mod/page/view.php?id=153402#check
Kind regards
Pete and Simon
GLEU