If you've lost more than .5 kilo a week you are overdoing it.
Overtraining is a frequent cause of injury, in my experience, and this time of year, many riders start ramping up, doing brutal group rides, racing season is ON!! etc. .
If the muscle ceased to be sore in three days, it wasn't seriously pulled. What happens is that one side (the uninjured side) is subconsciously shifted into taking the load off the injured side, and guess what happens? When I was young and had less sense, I had many running injuries, and it always followed that pattern, left knee, right knee, then left foot, right foot, and on and on; I live in the Southern US so it was easy to stay sore year round.