Long post sorry!

So I'm currently 17 weeks and 4 days with my little peanut, I am huge for 17 weeks and even though there is all this belly I'm still feeling the baby really low in my pelvis still... Is this normal or has the baby not realized there's all this belly? Also two days ago my mom and 4 yr old were playing and some how ended up falling on me and jabbing my elbow into my lower abdomen where my pants meet belly and ever since then when I move just right or pee I get sharp pains, I go to the doc on the 15th and just wondered if I'm just bruised or if it could be something more serious... TIA!