Delayed Menstruation: Impact of Birth Control Pills and Pregnancy Risks

Menstrual delay

The menstrual period was from January 19 to January 22, and the next period was from February 15 to February 18.
I took the contraceptive pill Anlitin on March 18.
The menstrual period was from March 26 to March 29.
After finishing the contraceptive pills, there has been no sexual intercourse, and my period has not arrived yet (it is now April and still no period).
Is this due to the effect of the contraceptive pills? Also, if there was sexual intercourse with a condom used throughout and withdrawal before ejaculation, is there still a possibility of pregnancy?

Niming, 20~29 year old female. Ask Date: 2017/05/05

Dr. Huang Jianzhong reply Obstetrics and Gynecology

1.
Menstrual period was from January 19 to January 22.

2.
Menstrual period was from February 15 to February 18.

3.
Took Anliting contraceptive pills on March 18.

4.
Menstrual period was from March 26 to March 29.

5.
After finishing the contraceptive pills, there has been no sexual intercourse, and my period has not arrived until now (no period in April).
Is this due to the effect of the contraceptive pills?
Answer: It is likely due to the effect of the contraceptive pills.

6.
If there was sexual intercourse with a condom used throughout and withdrawal before ejaculation, is there a possibility of pregnancy?
Answer: It is unlikely to become pregnant.

Reply Date: 2017/05/05

More Info

Understanding delayed menstruation can be complex, especially when considering the effects of birth control pills and the potential for pregnancy. In your case, it appears that you have been taking a birth control pill (安立婷) and have not experienced menstruation since your last period in March, which raises some important points to consider.

Firstly, birth control pills are designed to regulate the menstrual cycle and can sometimes lead to changes in the timing and flow of menstruation. It is not uncommon for women who are on hormonal contraceptives to experience lighter periods or even missed periods altogether, especially if they have recently started taking the pill or if there have been changes in their dosage or type of contraceptive. This is often referred to as "amenorrhea," which is the absence of menstruation. In many cases, this is a normal response to hormonal changes induced by the pill.

Regarding your specific situation, since you have been taking the birth control pill consistently and have not engaged in any sexual intercourse after completing the pill (with the exception of using condoms), the likelihood of pregnancy is significantly reduced. Condoms, when used correctly, are an effective barrier method of contraception. The fact that you mentioned you did not have internal ejaculation further decreases the risk of pregnancy. However, it is important to note that no contraceptive method is 100% effective, and there is always a small chance of failure.

If you have missed your period for an extended time (more than a month), it is advisable to take a home pregnancy test to rule out pregnancy. These tests are generally accurate and can provide peace of mind. If the test is negative and your period still does not return, it may be worth consulting with a healthcare provider. They can evaluate your situation further, considering factors such as your overall health, any stressors you may be experiencing, and how your body is responding to the birth control pills.

In summary, while it is possible that the missed periods are a result of the birth control pills, it is essential to confirm pregnancy status with a test if you have concerns. If you continue to experience irregularities in your menstrual cycle or have any other symptoms, seeking medical advice is the best course of action. Your healthcare provider can help determine the underlying cause and suggest appropriate steps to manage your menstrual health moving forward.

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