Hello Tina. Lots of us on here have had the same as you, myself included. There is a lot of anxiety, naturally, because now a days it seems the first thing the medical profession tells you us that they are looking for cancer. But in actual fact, most times it turns out not to be and that could be the likelihood for you too. There are so many reasons why there is bleeding and most of them is nothing serious, but it's good you are booked in for it to be looked at. Having a GA is nice too, I had one!
I learned from my meno consultant the other day that high doses of oestrogen (Which I am on) will cause bleeding. Not enough progesterone can also cause it. I believe that fibroid may cause it and I've heard of people having them and yet they didn't show on the original scan. And there's more harmless reasons too.
So have a good read here and see what you can find out about causes of bleeding. There is a huge amount of 1st hand experience here. Incidentally, the results of my hysteroscopy were fine and there was no reason for the bleeding as I wasn't then on the high dose of oestrogen I'm on now. So that could be you soon, too.
If you can, try to concentrate on the fact that the vast majority of times it ISN'T cancer. Try not to let your mind concentrate on your worries and replace those worries with something else - whatever brings you happiness, if you can.
I know someone else who has been in your position will be along soon to offer more advice.