I had breast surgery today. Is it normal to put a towel in it?

I've searched a lot for reviews of my sister-in-law 's Amuri, but there's no one who put a towel in their sternum;;; Is this right? I'm suddenly worried that my sternum will fall apart.. I'm 167, 49, and I put in 350-400cc in my men's X, and it's old. They told me to just bring the towel with me if I fall asleep with it, but can I just take it off?