Abnormal bleeding and thick endometrium

Skipped my period almost 2 month and finally started on Janurary 20. I have been bleeding since. I went to the doctor today and they done an ultrasound. The doctor came in and told my that my uterus was just nasty and bad and they need to figure out what is going on. My uterus endometrium was measuring 20mm. She said that is THICK. She said that even with all of the bleeding it is not shedding the lining. I’m scheduled for a biopsy to rule out cancer on Thursday. After that I have to have a hysteroscopy to clean out the lining and do further tests. Has anyone else experienced this? I am a new mom and this is my worst fear.