In this case, your soreness is probably telling you you're doing something you aren't used to doing.

Chances are pretty high you'll continue to get sore from challenging yourself. You'll find some body parts have more of a tendency to get sore than others, so your biceps and triceps may have gotten a good workout even though they aren't sore. You may not be able to tell whether what you are doing is working for every individual body part for a couple of months so don't get too concerned about lack of soreness just yet.
Don't work muscle groups that are sore until they're no longer sore. Soreness is an indicator of needing time to repair. At most, you may want to do some light cardio and stretch to assist your legs in doing that.