I believe so, but since no attempt was made and my amulet is part of the closed-set up so I won't know whether or not it actually blocks being culted (I am 99% certain it does unless the cult isn't actually vampire and is mundane in nature) until it is tested. It also works when I redirect a culting attempt so I am still vulnerable to being directly culted.
What I do know is that Nictis was not culted last night, but may be pre-existing scum.
I would only know if I was targeted, either directly or me redirecting them via lighting rod or someone else redirecting them.
I can't ask Cyricubed on how my heirloom works as it is part of the closed-set up section of the game so I don't get any details on it like I do with my lighting rod ability. From what I do know, it protects me from vampires and activates when I am using my lighting rod power. I hope it is the former in that I am aware of the actions being taken when they are stopped, but until I can't dismiss the possibility of the latter being the case as I may not be aware of any stopped actions if the heirloom stops them before they can reach me.
I am aware of them if the original target would also be aware of them, but if the original target wouldn't know about them, such as the power of Nami and QT, I also wouldn't detect them. I didn't detect any visits last night, but I didn't detect QT or Nami last night so there might be a third I didn't detect. I also have no way of differentiating between visits directly targeting me or visits that I redirected towards me.