Mine did too, due to the discovery of low platelet levels in my blood. I had hotel booked, hubby had a week off work booked to look after the kids, we had plans for the children looked after for the weekend etc…and only found out the day before! Was hectic but now all is sorted, and now have op the same day as beckie90 
Best thing to do is to make sure you are honest at all your appointments, and keep badgering your GP to get back to MYA asap when they are needed for anything. I had to go in and see them to make them do it! If you have no problems with medical history, you should be fine! xx