How long after an emergency contraceptive can i start normal contraceptives?

No limit, but: What a woman does depends on how good she is a managing her life. If she only uses E.C. pills once or twice in a lifetime, then her management skills are likely pretty good. She can start birth control pills anytime or wait for a normal period to happen. The problem of waiting is that she may end up pregnant during the wait. Three weeks after E.C. pill use, a woman checks a home pregnancy test.