Most doctors' receptionists are human and will move heaven and earth to get any woman who calls saying they've found a lump seen straight away, because they understand how worrying it is.
Same way you get seen quickly at the hospital. It's a breast lump = you get seen.
When I found mine, I had a GP appointment within 35 minutes at a surgery that usually expected you to know six weeks in advance that you were going to be ill and was at the hospital three days later. The GP, a young man, couldn't help but look worried when he felt it immediately (he asked if I wanted a chaperone, obviously, but I didn't give a shit, I just wanted it checked out there and then, rather than potentially wait 2 minutes for somebody to walk down the corridor to us, so my boobs were out almost the instant I said 'no, it's fine' 
)
It was nothing.
A friend's wife wasn't so lucky, but she was also seen quickly, has just had the first post radiotherapy check up and everything is clear.
What I'm saying is that worrying is completely normal, but being seen quickly doesn't mean it's automatically the worst case scenario, we're seen quickly just in case it is, so in those cases, we receive treatment quickly.
