Yesterday I took plan b about 40 hours after sex. I have been off birth control for 2 months now but today I saw my dr and got a new prescription. I'm scheduled to start my next period in 2 weeks but if I start my new pack of pills I won't get it for 24 days. Since i took plan b should I wait to get my period before starting my new pack of pills to see if I'm pregnant or just start them now anyway?