Lure Module Tips and Tricks

Since I don’t spend money in the game, I only had two lure modules given to me for level ups so far. I’m level 10 btw. However, I though if I use one, I will attract the Pokemons that are usually around that area. This didn’t happen. I specifically went to an area where I always caught Eevee and during 30 minutes I caught none. Eevee appeared in Sightings, but not in the Pokestops’ area. So, do you know something I don’t know?