Sometimes seeds can take up to a week or more to pop so be patient. The soil you are using will keep those plants going for a while. I wouldnt rush into adding nutes until you get the basics down. When you start adding stuff too fast to your grow you will have many problems. Keep it simple. Keep to the basics. If you look at my avatar you will see a plant 3 weeks into flower. Using the same soil you are in with only water added the whole grow so far. No nutes. I have nothing against using nutes I just see alot of noobs over doing it. Good luck