what kind of lighting are you using and how often are you watering/feeding and if you are feeding any nutes which you should not be at this stage stop
also what else are you doing
Just give it some plain water, keep the light close enough, but dont overheat the plant. Give us some details on how your growing(all the supplies yoour using and equipment)
get some fresh compost and repot it just incase and keep an eye on it over next few days.in my eyes tho i would prob just start again as your not that far along anyway just yet plus its always better to strat with a healthy plant rather then a sick one