Small breast lump

Hi there, I’m just looking for some advice from anyone, basically I went to the gp last week as iv had pain in my right boob and on the night before I checked it and found a tiny pea sized lump, my gp felt it and has referred me to a clinic. My problem is that I’m pretty sure the lump is getting smaller, I’m not sure if it’s  my imagination as I keep feeling for it everyday since, but I’m almost certain it is... my boob is still very tender and doesn’t feel right, any way I haven’t received the appointment yet, and I am just wondering as to weather I should keep the appointment if by the time I get it, my boob is ok? Or should I go to make sure all is. I jut don’t want to feel like I’m taking valuable time up.