I'm sorry you lost your Dad.

Your feelings will come and will vary as you move through the process of grief that each person experiences at their own pace and their own feelings, which can include sadness, anger, regret, fear.
Perhaps at the moment you are stunned or feeling as if you 'should' be feeling something in particular.

You may not feel too much now, then later something might stir up feelings: memories, seeing a Dad/child interaction in public or on television, a song, etc.

Maybe it is just too soon yet to be able to name what you are feeling.