Delayed Period After Emergency Contraceptive: Pregnancy Concerns and Symptoms - Obstetrics and Gynecology

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After taking emergency contraception following sexual intercourse, the menstrual period was normal for the first month, but it was significantly delayed in the second month?


Hello doctor, I had sexual intercourse with my boyfriend in mid-August, and later discovered that the condom had broken.
I purchased Plan B (levonorgestrel) and took the single small round white pill.
My menstrual period arrived normally in mid-September, but in mid-October, it did not come as expected.
However, I have been experiencing increased breast tenderness and have noticed white discharge.
I have almost all the usual signs that precede my period, but it is now two weeks late.
Am I pregnant, or could this be a result of the high-dose progesterone? Is this normal? Should I take a pregnancy test? If I am not pregnant, what could be the issue? Thank you.

Niming, 10~19 year old female. Ask Date: 2015/11/07

Dr. Lü Lizheng reply Obstetrics and Gynecology


The response suggests that hormonal imbalance may be causing irregular menstruation and delayed periods.
It is advisable to seek medical examination and treatment.
The irregularities could be a result of taking emergency contraceptive pills.
However, it is still recommended to take a pregnancy test to confirm that there is no pregnancy.
Sincerely, Dr.
Lu Li-Cheng, Taoyuan Hospital.

Reply Date: 2015/11/07

More Info


It sounds like you are experiencing a lot of anxiety and uncertainty regarding your menstrual cycle and potential pregnancy after taking emergency contraception. Let's break down your situation and address your concerns.

First, it's important to understand how emergency contraceptive pills (ECPs) work. ECPs, such as the one you mentioned (often referred to as Plan B or similar brands), are designed to prevent pregnancy after unprotected intercourse or contraceptive failure (like a broken condom). They work primarily by delaying ovulation, which means that if you take the pill before ovulation occurs, it can prevent the egg from being released and fertilized. However, if ovulation has already occurred, the effectiveness of ECPs decreases.

After taking ECPs, it is common for women to experience changes in their menstrual cycle. This can include a delayed period, earlier or later than expected menstruation, or even changes in the flow and duration of bleeding. In your case, since you took the ECP in mid-August and had a normal period in September, the delay in October could be a side effect of the high dose of hormones in the emergency contraceptive. Hormonal fluctuations can lead to symptoms such as breast tenderness, changes in discharge, and other premenstrual symptoms.

Given that your period is now two weeks late and you are experiencing breast tenderness and unusual discharge, it is advisable to take a pregnancy test. Home pregnancy tests are generally reliable and can provide you with a clearer answer regarding whether or not you are pregnant. If the test is positive, you should consult with a healthcare provider for further evaluation and guidance. If the test is negative and your period does not arrive, it would be wise to follow up with your doctor to rule out any other underlying issues.

It's also worth noting that stress and anxiety can impact your menstrual cycle. If you are feeling particularly anxious about the possibility of pregnancy or the effects of the emergency contraceptive, this could also contribute to changes in your cycle. Stress can lead to hormonal imbalances that may delay your period or cause other symptoms.

In summary, here are the steps you should consider taking:
1. Take a Pregnancy Test: This is the most straightforward way to determine if you are pregnant. Follow the instructions on the test for the most accurate results.

2. Monitor Your Symptoms: Keep track of any other symptoms you may experience, such as changes in your discharge, mood swings, or any other physical changes.

3. Consult a Healthcare Provider: Regardless of the pregnancy test result, if your period does not arrive soon or if you have ongoing concerns, it’s important to speak with a healthcare professional. They can provide you with personalized advice and help determine if there are any underlying issues that need to be addressed.

4. Manage Stress: Consider ways to reduce stress, such as practicing relaxation techniques, engaging in physical activity, or talking to someone about your concerns.

Remember, it’s completely normal to feel anxious about these situations, and seeking help is a positive step towards understanding your health better.

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