is it muscle? highly doubt it. but if you're happy with your figure, who cares?
If you're happy with your body, who cares what the scale says?
F 28/5'4/100 lbs
"I'm not a psychopath, I'm a high-functioning sociopath; do your research."
Water fluctuation due to glycogen or sodium probably, can also be a little muscle gain and maybe just maybe some additional fat gain…