Awaiting biopsy results

I found a lump in the left breast, upper quadrant and had an ultrasound and core biopsy on the 14th February. The consultant was convinced it was a fibroadenoma however when I had the ultrasound the person wanted to take a biopsy, they took two samples.  It’s a 18mm palpable lump, the consultant said to me I will recieve the results through the post within two weeks. It has now been two weeks and two days so I called the breast clinic, and the results are still with the lab. Which has really concerned me, i understand the lab could be busy but surely after two weeks if it was just a fibroadenoma they would’ve at least had them sent back ready for the MDT meeting especially when the consultant had given me a timeline to expect.  just feel really concerned and my head is all over at the moment. I am an oncology nurse myself and having knowledge can definitely be a disadvantage sometimes. I’m just not convinced and feel like my gut is preparing me for something other than a fibroadenoma. I previously had a major duct excision on the right breast, great aunt had breast cancer but no other family that I know of. Any stories or advice would be great. Thank you