Please try and not worry, I know that isn't easy to do. A uterine fibroid is the most common benign (not cancerous) tumor of a woman's uterus (womb). Fibroids develop with the uterine wall or attach to it. They may grow as a single tumor or in clusters. Uterine fibroids can cause excessive menstrual bleeding, pelvic pain, and frequent urination. I have read that the cause could be from hormonal levels. It is good that your doctor is checking your blood work and doing a biopsy, but until then try and remember that it is not unusual so I am sure all will work out for the good real soon.
Take care, Julie