i've been on the pill for a month and i recently had sex without the use of backup contraception. on afraid to ask's birth control section, it says:"If she starts [taking the pill] just after her period, she will theoretically be protected against pregnancy from day one, but should still use a back-up method (condoms and foam) for the first week (though some doctors suggest using a back-up method the entire month)."my question: can anyone help assure me that i won't become pregnant? i originally got on the pill bc i was only ovulating every 3 or 4 months. and not that it matters, but people always seem to ask about age- i just turned 21.