Lump found

I posted recently concerning about Pagets. My right nipple started oozing on and off 2 months ago. The clear serous discharge didn’t seem to be from a duct but rather oozing out from the superficial nipple surface. I have also seen minor peeling and crustiness in the beginning. Mammo/ultrasound negative. U/s showed cysts and fibrocystic changes on that side where oozing nipple is only. While waiting for surgeon appt, I put otc hydrocortisone on it and the skin cleared up and oozing stopped. Itchiness and weird sensation ongoing but no visible skin issue on nipple. Surgeon refused to biopsy and ordered MRI. I am waiting for my period so I can get the MRI.

Yesterday in the shower, I felt a pea like lump in the nipple area, very close to where the oozing was. It’s a bit movable but not soft. I called the surgeons and was told to schedule the MRI immediately. The MRI place said the earliest appt they have is next week. They will call if there is cancellation..

I am feeling scared and hopeless. Why didn’t the mammo/US pick up this lump? Did it just develop? Does it mean invasive cancer?