Do you think something is wrong?

OK I fell and hit my leg on the bed frame (its metal) a good 4 months ago... I was pregnant at the time and it swelled up with a big knot and a big bruise, it is about 3 inches above my ankle.. But I have already had already had my littel girl since then and like I said it was a good 4 months ago but there isstill a huge knot and a slight bruise on the spot, do you think this could be something wrong, At times it hurts and at other it is fine as long as I dont rub it.. but I would think the knot would have went away, does anyone think that there might be something wrong with it? I ahvent asked my doctor about it bec. the only doctor I go to is an obgyn doc for the pregnancy, has anyone had this happen and it last this long and not go away.. Just wondering