Would Using Of Long Objects For Masturbation Breaks The Hymen?

Hey
I am curious to know if i were to use a long object for masturbation could it be passed for taking my virginity ? Like to a doctor? I am 14, and i just lost my virginity to my boyfriend who i love very much... If my mother knew, she would kill me. We were very smart and mature about it and used a condom.... My mom tells me she wants to get me checked out to see if im a virgin, and i need somthing that will pass for my "stretched out ness..." lol please help me, shes a nurse... Quite smart with this stuff :S anything that would cover it up... What could i say i used? Could the doctor really tell? Thanks so much!