Premonition or eerie coincidence?

SRR
Had an insanely creepy thing happen at my first day of work. Before I got hired in I had a dream about the engineering office and for some reason in my dream there was a really old vault room(I had never seen the engineering room before this) and I put the dream completely out of mind. Get into my first day and there is a vault room built sometime in the 1800's. Again I had completely forgot that dream till my boss said I should go check it out. As soon as I stepped inside everything clicked. I kid you not everything sat exactly as it sat in my dream and I literally got sick and had to leave the room. I know some of y'all are not gonna believe a word I just said, but I am genuinely freaked out. It wasn't a happy dream I had. The building I work in is also a fallout shelter.