ok so I'm on yaz birth control& I've takn all of my pink pills iwas @ my 3rd white pill (sugar pill) &ihad sex because my period didn't come yet, bt durin sex my period came &it was a little heavy the day aftr then it soon became very light during the nxt 3days could I be pregnant? Becoz iusually stay on for 6-7days this time its been 6 but its been lightr than usual