So I am on my 4 month of taking trinessa and me and my boy friend have had unprotected sex but he pulls out every time. This month I switched my periods to the evening so every time I would wait a hour to set it to the time that I wanted was around 6:30. I am on my first green pill and have not gotten my period an I am worrying. Do you think there's a chance of me being pregnant? Or is it normal for the period to not start exactly when you start the green pill?