I used forms in the six months between coming out and starting HRT, during which period I was kind of genderfluid. Some days embracing the excitement of presenting feminine and other days retreating to the safety and familiarity of masculinity. By the time I began wearing my first AA bra, I ditched the forms. I was just so happy to have something of my own, that I didn't want to obscure them. I haven't even seen my old forms since and that was about 18 months ago. I should probably donate them to a gender charity or something.. ?
I did want to say though, that the transition from forms to real is so delightful. I am so excited for you!! My real breasts are a 14C now (lucky me) and some days I come home, take of my stifling bra and grin in delight that my boobs no longer fall off on to the floor. Or that I can shower without them sliding off. Or that I can sleep without the warning of the manufacturer in my mind, "Do NOT sleep with your breast forms!" Oh, and the sensation... omg! I can make shivers run down my spine and my knees tremble just by tickling my nipples now... yeah, they're amazing!