He never does this!

He works far like down town Manhattn..he starts at 6 pm but he leaves house at Around 4:50 to catch the train..his shif ends at 4 or 4:30.. He usually home by 6:10ish 
It's almost 8am 
I'm texting him and he doesn't tell me where he is!ive been up since he left..honestly this can be happening..
Should I be worried?
Or am I overreacting??