Hard to say. Bruises on your hip like that can be horrible. I've had a few big butt and hip bruises from falling off horses and wrecking bikes, and they all sucked. It could be that you also pulled smaller muscle or something (or the inflammation is knotting up some muscles). If you have a high pain tolerance and think it could be worse, there's no harm in getting it checked out. A good bruise will probably swell and start turning interesting colors pretty quickly, so at least you could locate the point of the problem and go from there..