I have learned many many things from people here on this site. I came home from surgery (diverticulitis emergency) with no information and no knowledge. Perhaps the most important thing I have learned is that there is no 'one' normal. We each move toward our own understanding of what is our personal normal. After a year and a half I am just beginning to understand what works for me.
I have to take a stool softener regularly to keep things moving. I am sure there are good logical reasons - but the bottom line is that it works for me.
I did find lists online of foods that produce more firm stool and less firm stool. Ileostomy is very different and everything is liquid.
I think it is too soon to know what your normal is but 3 days ??? it might be time to contact someone from your team .... doctor or nurse. Sometimes it is difficult to get things moving. Your entire system has been traumatized. They gave me warm prune juice in the hospital - a few times.
Good luck and stay in touch - there is always someone to offer support.