Hello. My experience is similar to others. Had spotting which stopped before the ultrasound. Ultrasound came back ok. Continue to monitor and see you in a year. Never received a reason for the spotting and even though the questions were in the back of mind I let it go. Almost a year later spotting started and stopped. Had ultrasound which indicated thickening. Then biopsy showed stage 1 endometrial cancer. Total hysterectomy and final pathology stage 3. Chemo and both forms of rad and am now 1 1/2 years in remission. I’ve lived with and will continue to live with regret that I didn’t push fir more testing after first spotting to find out why. Had I had the biopsy the first time it might have been caught at stage 1. So my advice is to keep pushing until you get an answer Best wishes to you