Worried my iCloud account has been hacked :-(

Hi Everyone, Hopefully someone can advise on this (I'd be really grateful)...

This morning I clicked on an 'unsubscribe' link in an email (The Hut Group). A blank webpage appeared, with a url which just seemed a long list of characters (unfortunately I didn't record it in anyway). I then logged in to my iCloud account and clicked on Mail - my mail was there as expected, and I started to look for a rule to try to see if there was an additional way of stopping the annoying spam I'd been receiving (from The Hut Group) from downloading from the server. Before I even managed to locate anything I got a popup dialog box telling me that my 'Mail has stopped responding'. I've attached a screenshot of it (with iCloud mail in the background). I clicked on the 'Send to Apple' link without thinking. I'm now wondering if this wasn't a genuine iCloud error at all, and it was in fact a phishing hack to obtain my apple ID info and email? :-( I didn't think to hover over the 'Send to Apple' link to check that the url looked ok. Has anyone else had this? Does anyone know if it is a genuine iCloud link? ...I'm currently in the process of changing passwords etc - it's going to be a long day :-(

Thanks,

Janet