Can the implant fall out of place and move near/on top of the heart?

I had my breasts done almost 4 years ago. Subglandular with silicone implants. I was told the skin on my left breast is thin and so id feel the implant more on that side. When I lean forward it feels slightly bumpy on the left not on the right I can’t feel it. I’ve been getting pain and feeling of a trapped nerve in my left breast underneath. Can the implant fall out of place and can it move near or on top of the heart? I’m trying to see why I am getting this pain. I had a baby 15 months ago