Back injury doing Ripped in 30

klappeh

Sooo..yesterday was my 3rd day doing Ripped in 30 Level 1. I think it was during good mornings my back muscles started to feel weak like i was giving them a good work out. Maybe my form suffered in the process. Afterwards though it started hurting and i sat down after i finished the dvd. Once I stood up again after like 15 mins it killed! The only way it won't hurt is if I was with terrible posture and round out my lower back. It feels like a pinched nerve more than muscle ache.

Anyone ever get this? What happened?? How long should I wait to work out again?
*super bummed*