Black Widow symbolic meaning?

Weird situation, every few days I come to the door of my apartment, and I see a black widow in the same spot, and I kill it. With a shoe meaning it is no more. However with in 6 days another one has taken it's place and I kill it too. Now this happens every 6 days and now I'm starting to wonder what it means. (this has been the 3rd time) *it's not figurative either, this is happening in reality(i know it sounds like im crazy)