Bleeding Nipple

Hello, I am new here but not new to HA. I normally have it pretty under control these days, but am having a flare up due to a symptom I have.
I noticed a few days ago that I had some drops of blood in my bra on the right side where the nipple is. After a little bit of poking, sure enough a very small amount of blood came out of the nipple. I went to urgent care, and the doctor said she didn’t feel anything of concern but referred me to get a mammogram and an ultrasound. My appointment is on Thursday and I am quite scared. The nipple seemed better yesterday, but has just a little bit of bleeding today when I poke at it.
Is this a common symptom of breast cancer?
Oh, and I am a 37 year old over weight female, with no children.