sorry i'm late to this thread. i hope this goes well for you. know you're not alone in those thoughts. i never went until i had terrible pain and had no choice at 22. the dr asked me where my mom was, since she could tell i was dissociating so badly. She could not "tell" any "history" just from looking ( you were concerned about that). but things are different for everyone. years later i finally asked her if she could "tell" but she just looked at me like i was crazy and said that (yes i am using code-speak, sorry) "that could have been 'opened' due to sports (which didn't play) or horseback riding, gymnastics (*looks around for some other sporty gal behind me*) or any number of reasons, kids are so active these days". Last time i ever asked her questions.
In theory it is better to go then not... i happen to be avoiding mine. But every time i try that, i end up in serious pain and in the hospital *sigh*. So courage to you for going. And lots and lots of hugs, feathers, ice cram sundaes, and teady bears (cheetas).