You can try putting it on 24/0 light schedule, and adding more light, and giving it a 'grow' fertilizer or adding a drop or 2 of superthrive to the solution next time you water. Don't use too much though.

Do you know the strain? Lowryder and other ruderalis hybrids will flower under 24/0 light. One phenotype of Mighty Mite will flower on 18/6. These are NOT common strains to find as bag seed though, so if you do not know the strain, chances are that it is not one of those.

You might just be seeing pre-flowers.