I Have Been Taking Yasmin For 3 Months. I Took

I have been taking Yasmin for 3 months. I took the last active pill on Friday and should have had a period starting on Saturday. It has been a few days and nothing has happened. A couple of days during the last 21 I was a few hours late taking the pill but never completely missed the pill. I'm really worried I could be pregnant. What are the chances? What should I do? If really appreciate your advice.