Congratulations on your first Solo, I did my first Solo on the 2nd April and still find myself day dreaming about it.....
I had gone around the pattern for half a dozen take off and landings with my CFI on board, and then he hopped out and told me to go do 4 take off and landings to full stop.
I taxied back out to Runway 29 which had been active all day, checked the ATIS then checked for traffic and announced my intentions to take off on 29 and stay in the pattern, just as I was climbing out a pilot entering the pattern announced a change in wind direction and R23 was now the preferred active runway, as did the #2 in the pattern behind him......this change was not in my first solo plan !
Anyway, I stayed as calm as I could and climbed out longer than I would have before starting to make my crosswind turn,I checked for other traffic in the pattern and then I announced that I was now going to be entering downwind for R23, all went well and I managed a pretty good base/final and landing.
My CFI was on a handheld radio but kept quiet and watched, listened, and let me handle the change of runway situation myself, when I got back to the ramp he commended me on my decision making...
Not what I expected on my first solo, but goes to show things can change in the blink of an eye, so all good for the learning curve though.
Good luck with the rest of your training.