The main reason for the pain and swelling of the breasts when taking the emergency contraceptive pill is that the pill is a highly effective progestin, and the breast gland will change under the action of estrogen and progestin, so the pain and swelling of the breasts will occur, and most of the pain and swelling will disappear after a week or so, so don’t be nervous. In addition, do not use the emergency contraceptive pill as a regular contraceptive method, mainly because the emergency contraceptive pill side effects are relatively large, daily life can use condoms, or can be intrauterine device contraception, contraceptive effect is good, but also health and safety and side effects and less, in daily life can adopt these methods of contraception.