pain in my back

Harlie
I'll be 14 weeks tomorrow. I've been having pains in my lower back for weeks now. Well I ignored it because I thought I was sleeping on it wrong. Well today when I sit down it hurts and when I walk it hurts. Also there's a pain that shoots down my left leg when I walk. I have no idea what it could be. 
My next appointment is February 28th. I don't know if  I should wait that long or not. I wouldn't think it's the baby causing pains.