Nope. They won't care. Just tell them that you've been called home and have to leave.

They won't care. You've already paid.

I've done this before but instead of checking out (it was my first hotel incall and I was chicken) I left the key on the room and went home.
No issue doing that, and I have done it several times before when doing incalls!

I agree with Caledonia - I'd stay on til check out (or arrive at check in time) and advertise more incalls for that day, especially if you don't usually offer them. Maximise your profit!

Or is the client paying for the hotel?

Op said that she had arranged hotel and she would check in then client will come. So hope for her sake he turns up.

Yes, I am hoping "arranged" doesn't mean "paid for". Hopefully she just means she booked it and the client will pay on arrival.

The hotel wont think ubr an escort. You could be having an affair wth this guy and checked in for some fun. Im sure lots of people having affairs do this so dont worry about it x

In a lot hotels u have box when u put your card for early checkin
...  If is hotel full payed  and no deposit then is check out just  formal .. Sometimes  I leave nigt before check out just take off -don't distrub from my door, and walking out, come back in same hotel never had problem

Do you know the hotel?  Is it a busy one ?  Busy reception, various members of staff? 

As long as you play it cool there should be no problem.  I've used hotels in the past and as quickly as a same day too.  Would you necessarily need to check out immediately after?  Sometimes I've just gone off with the room card (big hotels) and they don't necessarily need or care if they get the room card back. 

Alternatively so as not to alert suspicion I've even gone home to spend the night and gone back next morning purely to check out! A nuisance but left me at ease! 

Key thing is to act natural.  Most people wouldn't bat an eyelid.  You can always say an emergency as cropped up and you need to dash off. 

Once I had a client book a room for us and when we checked out he gave some blurb on being called home so they gave him a discount off the room! 

Good luck and try not to panic.