Hi, Cyndy! I had what they called "tumor fevers." For awhile before I was dx'ed and for a brief time after my surgery, I would off and on suddenly spike a fever, often in the evenings, if I recall. They hit so fast...I would know they were coming, because I would get a sudden wave of dizziness...that's what I remember most. I can't remember when it went away, but after I started chemo...which was only about 3 weeks after surgery.
They are not common with breast cancer, but it does happen. Hope that is all it is. One month to culture blood seems like a long time to have to wait for chemo, but perhaps a nice break for you? Or will hey continue your current regimen?
Love and hugs...