Too early for nutes?

Plus, if you are using a pre ammended potting soil, the soil will already have enough nutrients in it to keep it happy for 3 weeks to up to a month. If your doing organics I would feed every 3 weeks until flower. Then every 2 to 3 weeks depending on how much your girls enjoy nutes. Can't help you with synthetic nutes, never tried them. I do know if you are using synthetic then be very very easy with feeding autos, especially in the beginning. They will nute burn very easily if you don't do half or a quarter of the recommended. If they like it and are thriving and you want to try a little more, than go ahead. But just keep it easy and small at first. Its hard to take away once you already add it to your soil. Alot easier to add then subtract.

At this stage what's already in the substrate should be sufficient for her to grow properly, wait at least 1 or 2 week more to start feeding.