stop thinking of your training schedule within a 7 day week. Your body doesn't know the difference if you squat on Monday or Tuesday.
Just get the workouts in - if you missed Wednesday's workout (let's say its Bench) just do it the next day you workout. So let's say you plan your workout like this:
Mon, Tue, Thurs, Fri.. But ruh roh, you can't work out on Tuesday because whatever.. Just do that workout on Wednesday and do the rest of the week as normal. Can't workout Wed? Then just do it the next day you can and move the week back. So your M/T/Th/F week might turn into M/W/F/Saturday. So what. It doesn't matter.
edit: and if you can't do it Saturday, just do it Sunday or Monday. You might wind up working out 3 days one week and 4 days next week, just do M/W/F/M instead of M/T/Tr/Fri. Just do your workouts in order and you can stop giving a fuck what day you actually do them. Just get to the gym when you can and continue to do the workouts in whatever order you chose. Your workout week might turn into 9 or 10 days instead of 7.. and again, it doesn't matter at all.