Hi! Tomorrow it will be the 4th week of flowering,...

It's completely normal. Patience is the name of the game, here's a description of the different phases of the flowering stage: 1. Pre-flower / stretch phase (2 or 3 weeks): Plant grows rapidly, in this stage the need for growth nutrients is high and the plant ually doubles in size (indica) or even triples it (sativas). 2. Flowers form (2 or 3 weeks): in this phase flowers begin to appear, but they are still thin, as they only grow along the branches. During this phase the flowers grow in height. (This is the stage you are right now) 3. Flowers grow in size (1 or 2 weeks): During this phase the flowers grow in width, this is when you see them fattening up. 4. Flowers put on weight (1 week): During this phase the calyxes swell and the flowers gain most of their weight. 5. Ripening (1 week): During this phase the stigmas change color and become yellow, then shrink and finally change to a reddish brown color. It's during this stage that the thricomes mature. As you see most strains will take from 7 to 10 weeks: 7 or 8 been the most common hybrids and indica dominant strains and 10 plus weeks for sativas.