Back pain and pregnancy: how to deal?

Question: 

How do I deal w/ what I think is an old injury to my lower back?

Answer / Suggestion: 

I think I've hurt my back (I suspect a bulging disk from people's descriptions around me, but never diagnosed) and I don't know what do do about this. I've been having off-and-on aching and flat out "I can't move" pain lately. Your suggestions are welcome! I'll be bringing it up at my next OB appt. If you've been dignosed, plz tell me what I can do; how to help myself!