There is no evidence to show that taking the emergency contraceptive pill, even repeatedly, will affect your future fertility. The most widely used emergency contraceptive is very safe and contains less than half the active hormone contained in a monthly cycle of normal contraceptive pills. It can be used more than once in one cycle if needed. The hormone leaves your body within days, so you need to use another form of contraception to protect against pregnancy if you have sex again during that cycle.