I got my lip pierced 2 days ago and its really starting to hurt now?

If you used mouthwash with alcohol in it, then it will have irritated your piercing, and it means it will take longer to heal. Whatever you do, do not drink alcohol or use mouthwash with alcohol in it until the piercing has completely healed. I did and my lip inflated to five times its size for a week. Be careful with what you put in or around your mouth for a week or two. :)