Do not trust that person they do not know what they are talking about.
Your plant is simply showing sex, that she is a girl true flowering has not started.
You do not have to believe just me, post that picture of your plant in the Live Stoner Chat and see what other here think!
https://forum.autoflower.org/t/live-stoner-chat-may-2026
Evidently there is no Guaranteed Analysis on your soil. This makes it kind of tough to make recommendations I will however be able to watch your plant and give you some recommendations by watching the growth.
Do not add anything yet.