What is the reason for less menstrual flow when taking birth control pills?

Patient's question:

I shared a room with my boyfriend, didn't breastfeed, took emergency contraception after the act, but my menstrual flow is less and white. What's going on? Is this normal?

Doctor's answer:

Using emergency contraception can easily cause menstrual disorders such as reduced flow, pale discharge, or spotting. This is not a normal period but rather withdrawal bleeding after emergency breastfeeding. Generally, a small amount of bleeding is a normal physiological phenomenon. If this condition reappears, it usually indicates successful breastfeeding. If there is no withdrawal bleeding, it does not necessarily mean breastfeeding is successful. This is simply a physiological effect of the medication. Based on your description, it is possible that the menstrual disorder may be caused by taking emergency contraception, which could be due to qi stagnation and blood stasis. If your menstrual cycle is irregular, it is recommended to use contraception after taking emergency contraception and resuming sexual activity. You cannot confirm the timing of your next period or menopause. It is advised to pay attention to breastfeeding and wish you good health!

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