Lower back pains..not sure what to do!

This will be my first time having a baby....I'm sure I'm pregnant but I haven't gotten tested yet. Will be soon. The thing is for the last 4 days I've been having really bad lower back pain on my right side. I can't sleep or walk hardly. If that isn't bad enough it goes into my right shoulder. Does anyone know what I can do to stop it? Or if this even from pregnancy? Help me out please. Thanks =)