I try and steer clear on giving advice on backs cos Im not qualifyed. Backs are a very important buisness.
I would say the same to anyone...
If you back hurts, do nothing untill it dont hurt anymore
If it not painfull to strech in a week then strech, If it hurts when you lift then stop. If ts not 100% in 2 weeks see a Doc.
If you want a more qualifyed opinion
PM John (JPFitness)
Im sure he'll be happy to give you some advice.