Can you use a wah and then have another pedal for another thing? Does this even make sense ? Do guitarist even use 2 pedals ever? I am so new to this so just asking about some thoughts I have

I recently bought the code 50 pedal and noticed that if I have the amp volume set to say 3 and then I hit one of the pedals to change to a different sound the volume changes...I need to figure this out quick as I have a gig coming up and this will obviously be a problem..thanks