Late and light period on yaz for the first time in 2 years

Patient: I’ve been on yaz for 2 years, have been taking it like I’m supposed to and never missed a pill. My period has always been exactly the same on the pill as it was before. However my last period started two days late, and was so light and barely nonexistent, I didn’t even need a pad. Is this normal, or could I be pregnant (even though my partner used a condom)?

Symptoms: Late and light period, no fresh blood