I have had countless scans for unscheduled bleeding. The last one showed thickening and fluid which the consultant said was suggestive of cancer. When I had my hysteroscopy 6 weeks later the lining was thin and no fluid was there. This shows that things can change very rapidly. There were no concerns and I was discharged. Reading other peoples experience on here alongside mine, in most instances there isn't a problem. Try not to worry, easier said than done, but the hysteroscopy will give answers and if by any chance anything needs to be done they will sort out a treatment plan.