Am I worrying unduly?

I found a small hard lump to the right of my left nipple, doesn't hurt at all. 

Referred to breast clinic and now my head is in free fall!

I had a lump last year which was just hard fatty tissue, I also had a mammogram at the same time and all was normal.

I am clinging to the hope that the mammogram would have picked up any abnormalities.. but my head is thinking the worst.

I have an appointment 9th March and its been longest 3 weeks of my life. I know that stats say it will be nothing but i have this sinking feeling in my tum that it's bad news. 

I have no puckering, or any other symptoms just a small hard lump almost like a pip  xx