Does slightly irregular solid mass mean cancer?!?

Hi everyone, this is my first post in this group. I'm 32 and noticed a lump in my left breast about a month ago. Two days ago I went to the Dr. Who sent me for a diagnostic mammogram and ultrasound. The mammogram did not seem to show the lump since I have dense breasts. I then had the ultrasound which showed the mass. Soon after the ultrasound was done the radiologist came in andd even to see the mass " real time". He then said could be a fibroadenoma but it was also slightly irregular and I need a biopsy. Everything ive read says Irregular means cancer. I'm so scared. Does irregular solid mean I have cancer?