Hold on a second. Why are you worried about trichomes on your plant? You have several weeks to go. Someone might see that to be Sativa and give you a better estimate on when you should start considering the trichomes. What is your strain? How old are they? Are they auto, fem, or photo? Looks like an outside grow?
If you want seed and smoke, and are wondering about cutting branches, you are cutting seed and smoke. You can smoke seeded bud just fine.
You didn't mention anything about having a male plant or pollen. Can't rightly get seeds without either. Someone did mention 'immaculate conception' in another post.
I'm going to be frank. Not Frank. Frank. You have a lot of research to do on pollination. In the mean time, work on growing some healthy females.