Sorry to hear that Bex! My cat Elmo ran out the front door of my old house last year. I was devastated, crying in work then requested a half day holiday, came home early and wandered the streets for hours alone in the pouring rain looking for her. The next morning when getting ready for work I looked out the window and she was in the back garden and we managed to get her. She was fine, think she had been in someones house all night being fed! Their instincts will kick in and they'll be fine, hope they come home soon x