What Is The Reason For Sudden Bleeding With Periods?

Hi, may I answer your health queries right now ? Please type your query here...48 years old...2 years without a period..on christmas day I began to bleed..today i went to gyn doc..for yearly pap and she also did a endometrial bx and when that come back she will get a ultrasound done....I am in the medical field...can you please tell me what it may be...polpy verse uterine ca