2cm Hard Breast Lump found so scared

Hi,

It's my first time posting and I am absolutely terrified. I noticed last week while in the shower a hard lump in my upper right breast, it doesn't seem to move and isn't painful. Went to see my GP Monday who has referred me to the breast clinic under the 2ww and I managed to get a cancelation for Tuesday next week. 

The GP said it was a 2cm hard lump, she also said as the edges seem smooth it could be a cyst (but she wasn't very convincing)  I am so afraid that it isn't and can't shake the horrible feeling that it is BC. 

Has anyone been in a similar situation I am really struggling to focus on anything but it being bad news and so worried what will happen to my little boy if it is BC

Thank you for reading this.