Thanks for the replies everyone, really helpful
My music tutor has prosponed my exam for a week because they don't want me to use it without it healed, my own piano tutor thinks I have inflamation of the tendons in my wrist, it's not where the thumb is, more leading down to my 4th finger and pinkie. If I practise though I do find it has a dull ache afterwords, or tends to throbe. Even at my work today putting keys in and out of cabinets, it was starting to throb.
I am defo going to try and rest it, as I have an extra week now, and plus I don't want to make the situation more worse.
I have started with a new teacher who is brillaint and who has been doing loads of technical exercises which I've never done before and I have been increasing the practise, so maybe just strained it with the increase.
Anyway thanks for all the lovely replies...PSL