Bubbles in my tube

I have had my pump now for two days and i noticed that i have little bubbles in the tube, is that normal? if is not how did they get there, and should i change my infusion set. I set this current infusion set up with my pump trainer and we made sure that the line was clear of bubbles. Should i be worried?

Thanks for the help, after i looked at my tube when i swithched out my infusion set i noticed that the spots that i was concerned about wern’t bubbles at all, they were stress spots in the tube that got cloudy when my clip pinched it or something. I felt stuipid when i saw this. but at least i know the answer, Thanks!