Transfer to breast clinic

Good morning! 

It is my first post and wondered if I can ask some advice...

I went to doctors a week ago because i found a lump on my breast. The doctor said it felt like a pea but is totally benign and I have nothing to worry about.. But for reassurance she will refer me to the breats clinic. 

I have my appointment in 3 weeks and now I'm freaking out in case its cancer ! Why would she refer me if she feels it is totally benign?

Has anyone been in a similar situation?

Thanks in advance!!