I don't think the feeling is uncommon. I think when talking about it taking 6 months, it is till others could see the difference. For some it only take 3-6 months.
I do know it took me about a month before I felt my breast buds start to form. It was a very specific day. I knew something was different. However, I was mostly checking out the smoothing and softening of my skin.
Others will have different thoughts. This is what can relay given my experience and what I have read of others here. You know what they say. Your mileage may vary.
Warmly,
Joanna