Every time I leave my house, my car, work, etc I check all three pockets to make sure I've got my keys, phone, and wallet. Not totally abnormal, but I check like 4-5 times.
I definitely have a "shower routine" as previously mentioned, as well as a "morning routine" that if anything happens out of order, I feel as if my day is going to be ruined.
I feel the need to do things in sets of 3. Example - Sometimes when I walk, I count my steps in sets of 3.