Yellow leaves after giving water without nutes

Only done one watering think its because pots too small so will feed until end of week 7

Looks like your still growing buds. They are densing up. I would not of gone to flushing and fade yet. The plant starts to consume stored energy and nutrients as a fade goes. Thus showing deficiency signs. Always give appropriate ph water. I don't start working the fade till my trichromes are starting to get cloudy. Or if the colas have stopped growing I will start it, to convince them to ripen. Good luck and happy growing 🌱🌱🌱

From the looks of things your flushing!! Are the trichs ready? The leaves are yellowing because there is no nutrients in the medium to keep them happy, hope this helps all the best 👍