Help needed urgently

Sorry to sound desperate but I turned to 12/12 tonight and I am due a water.
Normally I use chempak4 all through the grow but I have changed over to bio bizz bio bloom and was wondering if I can start using it now or wait till the first sign of flowers?
This new lease of life for growing is making me want to do things the best way.

Thanks

if youre in 12 12 start using the bloom nutes

Thanks for the quick reply, just what I needed

no problem

you dont start giving bio bloom until 2 weeks into flower the grow continues into flowering