Does Emergency Contraceptive Pill Delay Menstrual Cycle?

Can birth control pills cause a delayed period?

I took the emergency contraceptive pill on the morning of June 9th.
My last menstrual period started on May 5th, and I still haven't gotten my period by June 11th.
Does this mean I am pregnant, or could the emergency contraceptive pill be causing a delay in my period?

Emily, 10~19 year old female. Ask Date: 2020/06/11

Dr. Cao Guotao reply Obstetrics and Gynecology

Hello, it is possible that the emergency contraceptive pill is the cause.
Please wait another week, and if your period still hasn't arrived, I recommend seeing a gynecologist.
Wishing you good health.

Reply Date: 2020/06/11

More Info

Emergency contraceptive pills (ECPs), commonly known as the "morning-after pill," can indeed affect your menstrual cycle. These pills are designed to prevent pregnancy after unprotected intercourse or contraceptive failure, and they work primarily by delaying ovulation. However, one of the side effects of taking ECPs is that they can cause changes in your menstrual cycle, including delays in the onset of your period.

In your case, since you took the emergency contraceptive pill on June 9 and your last menstrual period started on May 5, it is possible that the ECP could be influencing the timing of your next period. ECPs can cause your next period to come earlier or later than expected. It is not uncommon for women to experience a delay of a few days to a week after taking the pill.
If your period does not arrive within a week or so of when you expect it, it is advisable to take a home pregnancy test to rule out pregnancy. ECPs are not 100% effective, and while they significantly reduce the risk of pregnancy when taken as directed, they do not guarantee that pregnancy will not occur. If the test is positive, you should consult with a healthcare provider for further guidance.

Additionally, other factors can also influence your menstrual cycle, such as stress, changes in weight, hormonal imbalances, or underlying health conditions. If you find that your cycle remains irregular or if you have concerns about your menstrual health, it would be beneficial to consult with a healthcare professional. They can provide personalized advice and help determine if any further investigation or treatment is necessary.

In summary, while it is possible that the emergency contraceptive pill is causing a delay in your menstrual cycle, it is important to monitor your situation closely. If your period does not arrive soon, taking a pregnancy test is a prudent step. If you have any further concerns or experience significant changes in your menstrual cycle, seeking medical advice is always a good idea.

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Hello, emergency contraceptive pills can sometimes cause irregular menstruation. It is best to use preventive measures beforehand. If your period is more than a week late, it is advisable to see a gynecologist. Wishing you good health.