Emergency Contraceptive Pills: Effects on Menstrual Cycle and Pregnancy Risk

Emergency contraceptive pill

On the morning of February 6th, around 10 AM, I had intercourse with my boyfriend, and my period suddenly started.
My boyfriend also ejaculated inside me.
On February 7th, around 5 PM, I took a single dose of emergency contraception.
Now, on the third day of my period, the flow has decreased.
Is this change in flow due to taking the emergency contraception? Is there a chance I could be pregnant?

Yi Ting, 10~19 year old female. Ask Date: 2017/02/09

Dr. Cao Guotao reply Obstetrics and Gynecology

Hello, if your menstrual period is also around the 6th of January, the chances of pregnancy are low.
It is always best to use contraceptive measures beforehand, as you cannot rely on the safe period.
If you still experience any discomfort, it is advisable to see a gynecologist.
Wishing you good health.

Reply Date: 2017/02/09

More Info

Emergency contraceptive pills (ECPs) are designed to prevent pregnancy after unprotected intercourse or contraceptive failure. They are most effective when taken as soon as possible after the event, ideally within 72 hours, although some types can be taken up to five days later. In your case, since you took the ECP on February 7th after having unprotected sex on February 6th, you acted within the recommended timeframe, which is a positive step towards preventing an unintended pregnancy.

Regarding your menstrual cycle, it is common for ECPs to cause changes in menstrual bleeding patterns. After taking ECPs, some women may experience lighter or heavier bleeding, changes in the timing of their next period, or even spotting. The hormonal content in ECPs can disrupt the normal hormonal signals that regulate the menstrual cycle, leading to these variations. Therefore, the reduced flow you are experiencing on the third day of your period could indeed be a result of taking the emergency contraceptive pill.

As for the risk of pregnancy, if you took the ECP correctly and within the appropriate time frame, the likelihood of becoming pregnant is significantly reduced. However, no contraceptive method is 100% effective. If your period is delayed by more than a week from when you expect it, or if you experience any unusual symptoms, it would be advisable to take a pregnancy test for peace of mind.

It is also important to note that ECPs are not intended for regular use as a primary contraceptive method. They are a backup option and should not replace regular contraceptive methods. If you find yourself needing ECPs frequently, it may be worth discussing with your healthcare provider about more reliable long-term contraceptive options that suit your lifestyle and health needs.

In summary, the changes in your menstrual cycle after taking ECPs are likely normal and can be attributed to the hormonal effects of the medication. If you have concerns about pregnancy or your menstrual cycle, consider consulting with a healthcare professional for personalized advice and to explore ongoing contraceptive options.

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