If you're new to fermenting the smell of normal fermentation may be off-putting at first. Open up the jar and see how it's doing. Wait until after the gasses have disperse to smell your ferment. You'll get a truer sense of what it smells like when you let the gas release first before smelling the ferment. If it smells sour, acidic, or a little yeasty it's completely fine. If it smells excessively yeasty, alcoholic, metallic, or similar to paint thinner then that's a sign that your ferment is too warm and might not be good to eat anymore. Aim for a room temperature of around 72 degrees Fahrenheit when fermenting.