When I was training my instructor said to me at the end of one lesson "I expect you'll go solo next week".
I thought (worried!) about it all week, and made an
absolute hash of the following lesson! Didn't go solo and went home very disappointed.
Whether it was nerves, an off week, or whatever - don't worry about it, just concentrate on enjoying your training. One day soon it will all come together and you'll go solo!
RC