If you are still working at a job, hopefully you like what you are doing, are being paid fairly and will be able to keep the position. None of the above is a given. Sometimes we must do things we are not crazy about just to support ourselves, sometimes we are not paid what we are worth or as much as we need to live well; sometimes we find our job is gone through no fault of our own. That’s the way it is.
The idea is to be prepared for any eventuality. It is a really tough thing to be worried about it after the fact. For example it is Friday afternoon at work and you get a ‘pink slip’ out of the clear blue sky. If they have any decency at all (and are in a position to), they are giving you pay in lieu of notice or at least notice of 14 to 30-days. (Friday is the day industry recommends letting people go as this gives them the weekend to recover from