Possible endometrial cancer

I first saw my GP on July 17 for a postmenopausal bleed  and she put me on a 2 week suspected cancer referral.  I've had an ultrasound that showed 6mm thickness in the womb and I'm having a hysteroscopy tomorrow.  I'm stressing out about the result more than the procedure.  I live on my own and it's been torture going through this alone.  I had a smear test and bowel cancer screening and both were clear.  Keep thinking I can't be that lucky to get 3 negative tests...