Much more info required! My thoughts, start over as most autos are done at ~90 days, true some are bread to take longer but we dont know that.
Did you plant the seed 5/1 or is that when it sprouted?
What is the soil, PH of it, temps, RH. Many autos are starting to flower at 3 weeks old, what are the genetics and what is their cycle (60 days (12"-18"), 90 days (~24"), 120 days (~48"))?
Also topping/pruning is not generally recommended, instead look into LST (bending and tying down). Read the info in the links listed in that green bar above.
So tell us more!