I'm with you!!! I started my pm in dec and there is NO noticeable growth at all. It's so disappointing when comparing to the other girls who gain a cupsize in a month. I can't deny they are fuller though even if it is just a tad bit. I try to compare it to puberty though and my growth speed then. I didn't grow a cup a month during puberty so I don't think it's possible for me to grow like that now. I wish, I wish, I wish!!!! lol. It has just become a way of life for me now to noogle and take my vitamins (just like working-out). I just hope within 6 months I'll know I'm not wasting my time and money. I do have very little body fat to work (105 lbs) with so I'm sure that matters. I'm taking pm, msm, l-arg, sp, and sometimes fg. I'll be watching your progress! Maybe we'll have a growth spurt soon! 
Btw, I'm a 32B and it's not very full
Btw, I'm a 32B and it's not very full