Generally a plant won't show preflowers until 6-8 weeks if it's mature enough. And even then, sometimes they dont show till flowering stage. I agree that they are small for a month but that's not your question. Some growers take a cutting and put it under 12/12 and see what it shows for preflowers then they know whether or not to continue with the plant. But your plant doesn't seem big enough to me to take a cutting yet.
First 2 weeks were only sunshine. Its a durban poison strain. So maybe they grow small? I also dont have carbon filter. So the smaller the better
Just because it's small, doesn't necessarily mean less smell. I had an autoflower that was outdoors and only got about 22" tall and you could smell that baby from 100 yds.
Ah okay well the sunshine explains it.. get it under some good lights and she should take off... not sure about the strain.. but this is mine at 4 weeks man.. not boasting just saying..
well as the question was can you tell the gender of plant ,no its a bit to young its go to be at least 6 weeks old before you may get a little preflower so you can tell .....DP what your growing is a Sativa plant so it not a small plant either ,,but it can grow smaller than most sativa plants ,,,mac,,