Bone pain or joint pain?

Hi
I’m due to start on letrozole soon and have read about joint aches and pains being a side effect. Is there an easy way to tell the difference between what is a joint ache/pain from the tablets and bone pain which would need further investigation?
I’d heard about a 2 week rule for new pain but from what I’ve read regarding the side effects this wouldn’t help as they are long term. I don’t want to ignore anything serious but equally don’t want to be at the doctors every little niggle!
Thanks