when to start adding bloom?

When you see buds white hairs forming buds you can start with a bloom

They look fantastic.. how much p and k do you add now? if you don'tknow how much of it you are adding, now, randomnly boosting it (typical 'bloom' feed) isn't always teh best plan of action. Your soil must be fairly strong if that's all you have fed, so far... every soil can be a bit different as far as how much of each nute you have to suplement as it runs out in the medium. I'd assume you will have to provide much more soon... soil is a lot of trial and error due to the unknowns invovled. take notes.. realize some problems don't arise for weeks after you implement a formula. so, keep track because you won't remember the details and timing of previous events stretching a month or more.

Depending on formulation - just using micro thus far was a mistake. Usually micros are N heavy. Basically just N with micronutrients. Little to no P or K. You need a combination of them thru out the grow for healthy plants. I’m assuming you used a soil that saved you so far

If she is starting to show pistils I would introduce bloom now and just increase as you go.