This is not unusual, and never feel there is any time limits on when or not to grieve. Loss, effects people different, stemming from what kind of relationship they had,experiences/good times spent together,etc. There are no orders either, but some of the parts of it are, anger,denial,sadness,guilt,acceptance,etc. they will not or do not occur in a certain sequence, so never feel stressed if such emotions haven't hit yet, in some, they never do.
Take this with time to yourself and your heart, and know we are here.

(((((((((((((( AmandaK ))))))))))))))