Bone graft seems to have holes surrounding. Is this normal for healing? My dentist didn't seem concerned

I had a bone graft 5 days ago. Sutures are still in place, membrane seems to have dissolved. Bone fragments were coming out frequently prior to today, however when I looked today I see several gaps or holes surround the bone graft. I call my dentist who didn't seem concerned because I'm not experiencing increased pain or other symptoms. I am on an antibiotic also. Is this normal for healing or do I need to re do this procedure? Thank you