Lump in breast

I have been to the breast clinic because I found a pea size lump which was aching. The first doctor told me she thinks it is fibroadenoma. I went for an ultrasound, the doctor then wanted to biopsy the lump in my left breast and biopsy my axillary lymph node. They also found calcifications. 
I’m only 24 and waiting for my results is so stressful. I’m just worried.