I found two lumps in my breast. Fortunately they were both cysts and there's a good chance yours will be something similiar. Wonder why you can't get to Dr til Thursday, if it's because that's the first appointment you could get perhaps you should ring again and tell the receptionist about your lump. I'm not sure a few days will make much difference, please try not to worry. Once the Dr sees you, if you have the same experience I did, the NHS will swing into action and you should get a two week referral. Take care.