I need advice?

Okay so first off, I am on birth control, nuvaring, and I am currently on the 3rd day of my break week. This past month my boyfriend came in me 4 different times..now I am kind of paranoid. My period is very regular and always comes on the morning. Of the 3rd break day and it hasn't come..I know it's not that long but  stressing. I don't really even have period symptoms but I have been cramping some and have had white discharge..could I be pregnant? Any way to kick start my period? And advice what so ever l??