Can sleeping on your side cause implants to fall?

I am 5 weeks post op. I was told by my ps at 2 weeks post op that I can sleep on my side if its comfortable for me. Can sleeping on your side cause the implant to move out of position or shape differently or deform on the side? also, is it normal whenever you go from one angle to another you feel your implants shifting? Like from laying to sitting up or simply leaning down to wash my face in the sink. I was wondering if it's because they're new or if it will always feel like that