How long ago did you notice the mole change?

If it's recent then you likely don't have much to worry about because even the worst case scenario would be very unlikely to be very bad at all. By this I mean that, even if it is a cancer, it's very likely to be confined to the most superficial layer of your skin, if the change is very recent. That's super important because any cancer in the most superficial layer of the skin has no chance of spreading anywhere. In such cases, even if it is a cancer, they simply remove it and then check you, regularly for any recurrence or new moles.

Hi there and thank you so much for replying to me. I think it might have been there a couple of months. I didn't really think anything of it until I researched and realised I needed to go. The screening nurse seemed so serious that it's made me incredibly anxious. 
x 

Hi there and thank you so much for replying to me. I think it might have been there a couple of months. I didn't really think anything of it until I researched and realised I needed to go. The screening nurse seemed so serious that it's made me incredibly anxious. 
x 

Hi MyLou34

The important thing to remember is you have noticed it quickly and it is getting looked at tomorrow. Early detection is key so well done for noticing it and getting it checked out. It may well turn out to be nothing to worry about, and even if it is you have caught it quickly so try not to worry. Do let us know how it goes tomorrow and good luck!