I just came in trying to figure out which 3 stars you were looking at. I am curious, how close were the stars? Say within a fist at arms length in
the sky? Orion's belt has 3 stars of course not in a triangle, but rather almost perfectly straight in a row. There is also the triangulum within
the orion but you would need a nice 6" dob or 4" refractor to resolve those, definately not a naked eye object.
Then there is the orion nebula which is close by in the arm. And finally the Pleiades which is really 7 stars but on a poor night or within the city
I can see how they might look like a 3 stars, of course, there is a nice nebula in there too.
In any case, when you get a chance, go out and see if you can locate them. As Orion is out this time of year so you should be able to nail it.
Draw it up or go download cartes du ciel for free and you can give us an exact map with star names.
Take care and happy hunting.