What can I expect at the gynecologist?

Bre • 29. Alabama. Enjoying life with my soulmate.❤️
I'm 21 years old and I've never been to the gynecologist. But, I called last week & made an appointment, & I have to be there today. In a couple of hours, to be precise. I'm not gonna lie, I'm nervous. I had my first period when I was 13, but I've never been regular. I have one to two periods a year. Sometimes I'm lucky and have three. I've had MAYBE 20 periods my whole life, but even that number is probably higher than the reality. I'm scared as to what the gynecologist is going to say. What's wrong with me? I love babies. I want to have two or three kids. What if I can't get pregnant? What if I waited too long, and nothing can be done? My fear is what has made me wait so long to make an appointment.. I don't want to hear that I'm infertile. I don't want there to be something seriously wrong with me. I've been fighting with myself all morning. My nerves are telling me to cancel the appointment but my mind and body both know that I need to go. What can I expect today, yall?