Will taking emergency contraception delay my period?
Since I do not want to get pregnant, I took emergency contraception last month. However, my period has not arrived this month. I would like to ask whether taking emergency contraception can cause a delay in menstruation?
Doctor's answer (1)
It is possible for menstruation to be delayed after taking emergency contraceptive pills.
Emergency contraceptive pills mainly contain high doses of progestin, such as levonorgestrel. Their mechanism of action primarily involves inhibiting or delaying ovulation and altering the endometrial environment and cervical mucus characteristics to prevent implantation of a fertilized egg, thereby achieving contraception. These medications may also interfere with the function of the endometrium and fallopian tubes, further affecting the implantation of a fertilized egg and indirectly influencing the menstrual cycle. The use of such drugs can elevate female estrogen levels, directly causing menstrual irregularities or suppression of ovarian function. Generally, this effect can delay menstruation by 7 to 10 days.
In addition, emergency contraceptive pills may cause other adverse reactions such as nausea, vomiting, irregular uterine bleeding, breast tenderness, dizziness, headache, and fatigue. These side effects are usually mild and short-lived. However, due to the significant side effects of emergency contraceptive pills, they are not recommended for regular use as a contraceptive method.
If menstrual irregularities persist for several consecutive months, it is advisable to seek medical attention promptly.
