Biopsy results changed from letter to appointment

Hi,

I had a breast biopsy 10 days ago, I was asked if I was happy for my results to come via letter which I said yes to due to work. I was told I would not need a future appointment and I would get my results in 4-5 weeks. Today I have been sent a hospital appointment for next week, should I be worried as I wasn't expecting an appointment and the letter does not give me my results? Is this normal for hospitals to change from letters to appointments regardless of results? Thanks