Sure, it's possible!! Just remember that your gains are not "engraved in stone." They bounce back and forth. You gain. You retract. Back and forth. Kind of like many other kinds of growth--physical, mental, spiritual. The dick is no different. Just look at the long term--where you were a few months ago, and where you are now. It may end up you gain in volume and yet not see a measurable difference. How do you know you're gaining? You'll feel the difference. Your dick will feel heavier. There's more blood in there even if the ruler doesn't show it. Your dick cells are absorbing more blood. If we had some way to weigh our collective dicks we could add a third dimension: weight. I'd bet my bottom dollar we could (as a group) gain x number of ounces/grams during this time period.
Sometimes I forget where I was and where I am now. My whole package, especially volume wise, is much bigger. Keep all this in mind and just keep at it. There is another thread about the importance of not letting a day go by that you don't do some kind of P.E. activity. This is the discipline we need to make ultimate gains.