Hi Nelson, I've been through exactly the same experience recently, having a bleed,for the first time in three years following breast cancer ( I'm in mid40s). I also had a relatively easy time of breast cancer (small lump, radiotherapy, no chemo, didn't feel ill etc) and thought his bleed was making up for it.
I had some scans where they found a thickening of womb lining - not in itself dangerous but can be an indicator of something more. Following that, had two hysteroscopies, one as outpatient and one under a general.
Yesterday they told me I Haven't Got Cancer. Still can't quite believe it! I thought I was facing a hysterectomy this summer due to endometrial/womb cancer. I won't totally relax though, until I see the consultant.
Please feel free to ask anything or post any concerns. I got a lot of support here, especially from Marshy (waves to Marshy,) who,also,had the all clear. Hi to everyone else also.