Emergency contraceptives might not be a preferred method for regular birth control because :-
1) It is not as effective as birth control tools that is used before or during intercourse.
2) Also emergency contraceptives do not protect against sexually transmitted diseases like HIV.
3) It may also cause some mild side effects like changes in menstrual bleeding,fatigue,headache,nausea and vomiting.
4) It can prevent pregnancies only when it is taken within 5 days of intercourse.
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