There are occasionally weeks where I spin 5x a week (when the weather is particularly ugly). I don't have any issues because of the frequency... nothing like when I was running 5x a week and my hips, knees, and ankles were screaming. With spinning, no problems. But, I'm limited in my time, I can't spin 5x a week, and do weights, and x-train. So, usually I spin 3x a week, and 2x a week I do run/strength intervals. And at the moment I'm learning to swim.
It's great that you are incorporating strength training as well. If you're enjoying the routine, stick with it! Your body will tell you when to work on something new.
~ working mom to 3 little girls ~
Roadie... 2010 54cm Trek Madone 4.5, Bontrager inForm