I would do something I never take the time to do, ....STRETCH!
Not just a couple of trunk twists, but spend 20 minutes stretching your back and hammies (and anything else you can think of.
Then I would go ahead with BACK but I would focus on lighter weight and higher reps for today. Like the 8 to 15 range. It might be a nice change of pace for you? Better safe than sorry right?