Hey & welcome to forum!
I am kinda new to NBE too so can't really give you advices, but here's some personal experience from me:
I am also interested in using more natural and safer ways to increase my size, and after researches, I decided not to use hormonal herbs yet and started to take mainly Flaxseed oil and multivitamins, and massage with Flaxseed oil half an hour a day----and they worked!! It only has been 2 weeks but my breasts are definitely fuller. I also introduced soy milk and more nuts to my diet, since I am a bit underweight ANC want to gain some breast fat by diet.
If you want safer ways for NBE, you can just stick to non hormonal methods before you get your hormone levels tested...you could add some volufiline (I am planning to use isosensuals, but there's also some other brands), and noogleberry too, they are really popular in the forum

oh yeah and definetly LOTS OF MASSAGE!!
Also I still recommend you do some research on all those different herbs and evaluate what your body really need before you start anything hormonal
Good luck
Gwen