Lump does not show up on ***** or ultrasound

I found a lump over a year ago. I had a mammogram and an ultrasound and according to both tests, the lump does not exist even though at that time it was a hard, 2mm mass. I haven't really checked since then until yesterday. The hard mass is still there but it's more like a half an inch in size.
My Road to Nowhere
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I have a few hard, but small lymph nodes that are palpable; one in my armpit, one above the collar bone, a few in my neck and one in my groin, all on the same side as the breast with the lump. I am making an appointment to see my ob/gyn but while I'm waiting, has anyone else experienced a "nonexistent" breast lump?

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