Photo preflower or new leaf

Yes, the thing growing from the junction of the leaf stem and the main stem is a primordia/pre flower. Your primordia appear to be female calyxes, as indicated by the long thin pistils/hairs/stigmas evident in picture 2. Over the next 2-3 weeks your plant will transition to flowering in earnest and in another 8 to 12 weeks you should be able to harvest your first crop of beautiful home grown flowers. At this stage your plant still needs adequate nitrogen to begin the flowering process, so don't rush into giving just bloom nutrients too soon. Personally, I like to continue with grow nutrients until there are small tufts of pistils/budlets formed, before changing to half grow and half bloom nutrients for the next 2 weeks or so before again changing to just straight bloom nutrients through until harvest maturity. This seems to produce the largest flowers on plants that don't exhaust themselves and end up a sickly yellow colour at harvest time, and is a method I have been using for over twenty five years now and I find it works perfectly. Remember too, your plant will need every leaf she has, to make the energy she needs to grow her biggest and best flowers, so I urge you to resist any temptation to defoliate or remove any healthy green leaves. A small amount of well considered "lollipopping" is probably a good idea, although not essential, but removing large amounts of leaves just limits the amount of energy your plant can make, and without maximum energy production, she can not grow her maximum flowers! Each leaf is basically a solar panel. Less solar panels = less energy being made = less growth. Besides, if your plant did not truly did not need those leaves, it would not have grown them in the first place! As you can tell, I am definitely extremely against defoliation! Removing healthy green leaves and forcing your plant to grow new healthy green leaves, seems rather pointless to me and a total waste of energy for the plant in my opinion! Hope this helps, Organoman. (and anti defoliation psychopath!)