IT is possible if you had the film closer than the recomended distance to the safelight, or if the safe light is using a bulb bit brighter than recomended (typically 7.5W bulb, with a distance no shorter than 4 to 6 feet from the film).
You can always put a sheet on your working area, put some coins on top of it, and let it sit there accross from the safelight for several minutes, and develop it, if you see the shape of the coins, then your safelight is not safe, or it needs to be placed further away ( or direct light blocked, so yer onlyw orking under reflected light)