@ldamario Ahh…
Did you use Bitwarden premium (or family etc.) right from the start? Then you should be able to find your “subscriptions”/invoices in the web vault.
If you are relatively certain about which vault items you might have already created/used when you started Bitwarden: when you open any vault item (“View item”), there is an item history at the bottom. That contains the creation date of that item. (unfortunately, we don’t have sorting options yet, which would make it easy to just sort for the oldest vault item)
(one caveat: that second idea might not work if you purged your vault and reimported all items from an export in the meantime)