Micronor: Menstrual Changes and Pregnancy Concerns

Issues related to contraceptive pills?

Hello doctor, I have been taking Micronor (norethindrone) for 28 days for over four months now.
I experienced menstrual-like bleeding for the first three months, with shorter intervals and moderate flow.
My last menstrual period was from December 23 to 29, 2007.
Before taking the medication, my cycle was regular, occurring every 21 days and lasting about 5 to 7 days.
I don't understand! Could it be that taking the 28-day pill has caused my periods to stop? Is this irregular bleeding? Recently, I've been experiencing mild lower abdominal pain, similar to menstrual cramps, but not as intense as before I started Micronor.
I'm a bit concerned that I might be pregnant! However, I have tested negative twice.
I am still breastfeeding my child, who is 2 years and 5 months old, but I only give him comfort nursing at bedtime.
My husband thinks my hormone levels might be abnormal, and I haven't stopped taking the contraceptive pill yet.
Could the birth control pills affect the pregnancy test results (negative)? If I am pregnant, would taking the contraceptive pill have any impact on the embryo?

Hui (Dai Ri Dan Xin Ma), 30~39 year old female. Ask Date: 2008/02/12

Dr. Huang Jianxun reply Obstetrics and Gynecology

Due to the unavailability of this medication at our hospital, I recommend that you consult the prescribing physician or pharmacist regarding personal experiences with Micronor (norethindrone).
Please read the usage instructions carefully.
Generally, during the use of contraceptive pills, one should still have regular menstrual periods.
It is not advisable to breastfeed while using contraceptive pills.
If you are concerned about unintended pregnancy, you may perform a home pregnancy test.
If you experience irregular menstrual cycles while on contraceptive pills, consider evaluating their suitability.

Reply Date: 2008/02/12

More Info

When considering the use of Micronor (a progestin-only contraceptive pill), it's important to understand how it can affect menstrual cycles and the implications for pregnancy. Micronor is designed to prevent ovulation and thicken cervical mucus, making it more difficult for sperm to reach an egg. However, it can also lead to changes in menstrual patterns, which may be concerning for users.

In your case, you mentioned that you have been taking Micronor for over four months, and while you initially experienced menstrual bleeding, your periods have become irregular, with the last one occurring from December 23 to 29. It's not uncommon for women on Micronor to experience changes in their menstrual cycles, including lighter periods, missed periods, or even amenorrhea (the absence of menstruation). This is due to the hormonal changes induced by the pill, which can suppress the endometrial lining and alter the typical menstrual cycle.

The abdominal discomfort you are experiencing could be related to hormonal fluctuations, the effects of the medication, or other factors. It's important to note that while Micronor is effective in preventing pregnancy, no contraceptive method is 100% effective. Therefore, if you have concerns about a potential pregnancy, especially given your symptoms and the fact that you are still breastfeeding, it would be wise to consult with a healthcare provider.
Regarding your negative pregnancy tests, it's possible for hormonal contraceptives to affect the results, but they typically do not cause false negatives. If you suspect you might be pregnant despite negative tests, consider waiting a few days and testing again, or consult your healthcare provider for a blood test, which can provide more definitive results.

If you were to become pregnant while on Micronor, research indicates that progestin-only contraceptives do not have teratogenic effects (causing malformations in the fetus) when taken during early pregnancy. However, it is always best to discuss any concerns with your healthcare provider, who can provide personalized advice based on your health history and current situation.

In summary, the changes in your menstrual cycle could be a normal side effect of Micronor, but if you are experiencing unusual symptoms or have concerns about pregnancy, it is essential to seek medical advice. Regular follow-ups with your healthcare provider can help monitor your health and address any issues that arise while using hormonal contraceptives.

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