Should fetal movement be felt all over or only on one side or the other?

My baby moves a lot, and for that, I am thankful! But I don't know if I should be worried or not b/c I only feel her move mostly on my right side or right top, near the ribs. I don't feel as much movement on my left side. My stomach often looks lopsided on the right side as well. Could it be that the right side is just where she's decided to hang out? Or am I worrying too much that something may be wrong? I am 9 months pregnant today! Hooray!