I really don't think Harry will be going anywhere this week and i'm very happy for her to stay!
Tellymix is usually the site whose polls give the most accurate indication of what will happen and at the moment Jack has well over twice the votes to evict (36.92%) that Harry has (15.06%) and Simon also has more votes (17.64%) than Harry.
People know that this might be their only chance to get rid of Jack so i don't think they're gonna' waste that chance. If he doesn't go this week there's a very good chance he'll be there 'til the final.