34, bilateral hip replacement. fell on ice last night, concerned about potential damage. if i would have cracked the plastic, would i feel something?

Unlikely : If you fall hard it is possible to break the femur close to the hip prosthesis, especially in older patients. Generally one does not break the plastic because the plastic is surrounded by metal. One can wear the plastic over long period of time but it is gradual process. Sudden fall will not break the plastic. If it hurts get checked and x-ray to make sure you did not get a fracture of the bones.