It take a little while to a bank to process a foreclousure, depends of how many are in your area. Some times you need to receive three notificatios, before the sheriff arrives, those notificatios are 4 month apart each other.
Also during this time you can retent your home try to do a modification, the foreclousure precess will slow down, when you take action. try to sale your home, or try to negociate a short refinaciation. There are plenty of thing that you could do. but do not wiat for the sheriff. Take action.