white russian at 70 days?

hey everybody this is my first grow. i am growing 1 white russian (serious seeds) and 2 bubbleicious(nirvana) and they are at 70 days of 12/12. They showed their sex in veg. im getting worried because i started feeding with plain water about a week and a half ago thinking that they would be done at day 60 like the breeder suggested and im still not seeing any amber trichomes. the plants are getting really yellow and shriveling up. so do u think i will see any amber trichomes soon or should i start my fert program again? thanks for any advice

lets see some pic's plz, you will get a more accurate answer