Is 20 too early to visit the Dr. For Pregnancy planning?

So, I've been with my fiance for almost 3 years and for the last year now we've been having sex unprotected. We've been hoping I would be pregnant by now but it seems like no matter if I'm trying or havent been I'm still getting my period every month. My periods have never actually been regular since I got it when I was 14 but, I have a feeling it has to do with what happened to me as a child. A lot of people told me because I was molested and raped when I was very little that they probably messed something up down their and I'm kind of scared to go to the obgyn to have it checked out :/ I want a baby but I don't want to get bad news and I don't want to relive what happened to me when I was 4-5 years old :/