Have sore breast, discoloured, changed shape. took antibiotics, nothing! i'm scared its inflammatory breast cancer. can an ultrasound detect this?

Not necessarily: Inflammatory cancer of the breast is a clinically and pathologically defined condition. Mammo may show skin thickening or all sorts of different findings, ultrasound may not add much. I can't say more based on your description but if you and your doc are concerned enough, the way to go is a biopsy asap. Hope it's not cancer but if it is, fight well and best to you.

See doctor this week: I think that you should make an appointment to see a gynecologist or general surgeon this week. I would not wait. If you call and can't get in quickly find another doctor who will get you in quickly. I agree with you that since you had antibiotic treatment and there is no improvement that you do have cause for concern and appropriate tests should be run.