I've been going good on birth control pills but Saturday night I had sex with my boyfriend and he ejaculated in me ( I didn't even go pee It out) and I didn't realize I missed Saturdays pill since Sunday night (sat pill is the third row of pills and.the last row of pill before you get your period) I have to wait till Wednesday to see if I get my period or not.... Should I take my chances or take plan b Even though I'm on birth control