Personally I'd never even try PM, it's too strong of an estrogen supply, and might throw off my hormones. That and from what I've found in a lot of places is that the "growth" you experience while on PM is only temporary, once you stop taking it the growth goes away. It's more like that swelling you get right before your period, during or once your menstrual flow stops it goes away as well. A few lucky ones that noogle may make it permanent over time by noogling while they're on it, but you still loose whatever hasn't permanently grown once you stop. That's the results of the majority of the users that I've found info on anyway, many think they have permanent growth from it while they're on it, but it's not until they stop that they find out it's not so permanent. Forgive me if I'm wrong about this, that's just the majority of what I've found while researching it. By all means, if it's something that will do you good for what it does to the body and doesn't mess with your hormones then give it a shot, but I wouldn't expect permanent breast growth from it myself.
