Good Luck at the Doctors.
The sympotms can be SO varied. Some have pain (like me) others don't.Some havehave lumps in there breasts, armpit, nipple, above the breast, and anywhere at all around the breast (mine was in the 6 o'clock position alomst straight under my nipple near the crease of my breast.
You will probably be sent for a mammogram &/or ultrasound and possibly a biopsy if these tests whow something to see what it is.
There are other options except breast cancer, but breast cancer has to be ruled out.
Again Good Luck with you doctors appointment, I really hope for you it is nothing. but either way let us know, we are here to support you.