Breast pain and a lentil

[insomniarules]

Obviously I have made an appointment to see my GP but I was after a bit of advice of reassurance here.
I've got a lentil shaped and sized lump in my breast. It can be 'wiggled ' a bit and it's not attached to the tissue. My breast also aches and is painful, a bit like just before a period, and it's only that one that hurts.
My Mum and maternal grandma have both had mastectomies so naturally I'm concerned.
Is this sort of tiny lump normal or not?

it could be a breast mouse which is totally fine.

Good to get an expert opinion though.

I get these sometimes and they come and go. But if you have never felt one before you MUST get it checked. It is very unlikely to be anything though :)

Thank you. I had a mammogram and ultrasound in 2010 as I had eczema on my breasts and Dr wanted to be sure that's all it was. It's the family history that bothers me, my Mum's wasn't the inherited type but I still worry.