Hope not. I hope the piercing has been removed. If not, it needs to be. The brow is a pretty forgiving area as regards scarring. The main thing is to keep the site clean by washing with soap and water several times a day, perhaps apply Bacitracin ointment after washing, and generally get the infection cleared up asap. If it does not improve quickly, see your doctor.
Possibly. Infection can result in a poor scar. There are two recommendations. First let the infection totally subside and possibly consider scar revision at least six months later, after an evaluation by a plastic surgeon. Second, avoid any future piercings, since you may be prone to infections.