Not in Primal but if it shows up on your profile feed, it's been broadcast. You may try out Coracle if you want to see the Relays your note has been broadcast on. It is shown on the bottom right hand of posts.
Unfortunately, interaction is really light on nostr unless you're a nostr dev or Bitcoin influencer. Every once in awhile one of my posts will get some response, but with people being locked into their follow feed by default in most clients, unless they actively look at a global feed or hashtags, it is definitely into the ether as you suggest.