Those little tender f-ers can make me nervous , actually the whole grow from start to finish can make me nervous. I'm very attentive , scrutinizing each plant every day which allows me to catch any problem early.
Natural light from windowsill certainly explains your towering young seedling , I've seen people do that many times.......it sucks. Ya got cotyledons and leaves coming ,
your on your way. Your going to love growing. Give me a shout anytime ! I've been growing for 50yrs, indoor and out . I wouldn't over water , or over feed , that gives so many people problems.