I've pinched a nerve in my lower right side of my back twice in a month could it be something more causing it. the only thing i did wash was walk?

Get an exam: Good history and exam may determine where your pain may be coming from. Most back pain is usually easily treatable and you could seek out a good chiropractor and physical therapist to assess you. If symptoms persist and/or get worse then sometimes imaging is is order to take a look at your back. Start with physical exam first. Best wishes!