Delay in my appointment

I had surgery on 7 March for stage 2 lobular breast cancer. I had a lumpectomy and sentinel node removed. I'm recovering well but my appointment with the consultant on 9 April was cancelled by phone the day before as they had not received the results of the tissue samples taken during the surgery. I haven't heard anything since. I was told at the original appointments that I would have radiotherapy following the surgery. Do I need to be worried about the delay? I was feeling well but now I'm feeling stressed and in limbo. Thanks.