lol, had a pure sativa once that took a month to show flowers in 12/12 (and i kept it in 11/13 to speed it up and it was a male(they are quicker by a week with indicas)
but 2 weeks to show flowers is the standard for most hybrids and indicas.
meaning most take 2 weeks, some shorter (some lots shorter) and some longer.
the more sative the more longer, sometimes, like i said, lot longer.
no worries, give it a bit more, since its showing pistils you are probably allright, more light would help but isnt necessery, but with bagseed you are dealing with an unknown, just gotta grow and see.