It’s getting so real I’m nervous!

Hello ladies I’m looking for some advice as to what to expect. I am 28 and my partner and I have been TTC for three years. We finally spoke to the GP about 6 months ago who has referred us to the fertility clinic after not being able to find any ‘problems’. Yesterday I received my appointment letter and I’m now super nervous and was wondering what I should expect from my first appointment at the clinic? I live in Scotland if that’s relevant incase different countries vary.