Does taking birth control pills affect menstruation?

Patient's question:

On October 17th, I had sex with my girlfriend. On the morning of October 18th, she took emergency contraception. Today, October 23rd, she suddenly had her period. However, her period was supposed to be on October 8th, and it just ended. I want to ask if this is normal? Will it cause any damage to her body? How should she replenish?

Doctor's answer:

I hope I can assist you in purchasing this. Under normal circumstances, when taking emergency contraception, some individuals may experience withdrawal bleeding again approximately one week later. Based on your purchase situation, the bleeding on October 23rd is considered withdrawal bleeding. Generally, it is not advisable to take emergency contraception more than once a month, and no more than 2 to 3 times a year. Long-term use of emergency contraception can lead to side effects such as amenorrhea (absence of menstruation), irregular vaginal bleeding, and obesity, which can be harmful to your health.

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