Been using PM powder for 6 months and have got noticeable growth in my left breast and nipple, but only marginal growth in right one. Has anyone had the same and only got meaningful growth in one breast and was it a matter of timing and the other growing later or did one side never grow?

Unfortunately is not unusual for even genetic females to have the same problem, typically one side is always bigger than the other. Some more pronounced than others.

My left is a full B cup, my right is only an A cup 

You could exercise the smaller side with massaging or with noogleberry pumping.
x A

Thanks, was aware breast growth could be unequal but still a bit shocked at only having one breast only showing proper growth, it feels weird and looks strange too.
I’m applying PM cream to the non-developing one to try and get it to grow, so perhaps it just needs more time.

Try and sleep on the other side

Try and sleep on the other side

What difference would that make?