Why Is My Period Late After Finishing Yaz Birth Control Pack?

After finishing a pack of Yaz birth control pills, my period has not arrived yet?

I have been taking the contraceptive pill Yaz (24+4) for two months.
My period started on July 31, and I took the first pill of Yaz on that day.
My period lasted from August 26 to September 1 (it started three days after finishing the pink pills).
I took the first pill of the second pack on August 28, and I had sexual intercourse with a condom on August 31, along with some other instances of foreplay and oral sex.
I finished the second pack of Yaz last night, but my period has not yet arrived.
I should take the first pill of the third pack tonight.
I have been taking the pills consistently every day, but I had a cold for a while and took cold medicine.
I asked the pharmacist, and they said the two medications do not interact.
1.
Is it normal for the timing of my period to vary each month? My first pack had my period start on the third day of the white pills, but this pack has not brought my period yet.
Is this delay normal?
2.
Should I continue taking the new pack tonight? Should I wait for my period? If I start the new pack, will my period still come, or could I miss it altogether?
3.
Do I need to see a doctor? Is there a possibility of pregnancy? Thank you, doctor.

Nìmíng, 30~39 year old female. Ask Date: 2023/09/25

Dr. Cao Guotao reply Obstetrics and Gynecology

Hello, you should start taking the contraceptive pill on the fifth day of your menstrual period.
If you take it as directed, you should not become pregnant.
If your period has not arrived yet, it is advisable to wait another week.
If it still does not come, it is recommended to consult a gynecologist.
Wishing you good health.

Reply Date: 2023/09/25

More Info

It's understandable to be concerned about a late period after finishing a Yaz birth control pack, especially if you have been consistent with your medication. Let's break down your questions and provide some clarity based on medical knowledge.

1. Is it normal for my period to be late after finishing a birth control pack?
Yes, it can be normal for your period to be late after finishing a birth control pack, especially if you have recently started taking hormonal contraceptives like Yaz. Birth control pills work by regulating your hormones, and it can take some time for your body to adjust to the hormonal changes. The timing of your withdrawal bleed (the period-like bleeding that occurs during the placebo week) can vary from month to month, especially in the initial months of taking the pill. Factors such as stress, illness, changes in routine, or even the medications you may have taken (like cold medicine) can also influence your menstrual cycle.

2. Should I continue taking the new pack tonight? Will my period still come?
Yes, you should continue taking the new pack of Yaz as scheduled. Birth control pills are designed to be taken continuously, and skipping doses can increase the risk of unintended pregnancy. Even if your period does not arrive, you should still take the pills as directed. The hormonal levels in the pills will help maintain contraceptive efficacy. It’s also important to note that while on the pill, some women may experience lighter periods or even skip periods altogether, which is a common side effect.

3. Do I need to see a doctor? Is there a possibility of pregnancy?
If you have taken your pills consistently and correctly, the likelihood of pregnancy is low, especially since you used a condom during intercourse. However, if your period does not arrive after completing the new pack, it may be a good idea to take a home pregnancy test to rule out pregnancy. If the test is negative and your period still does not come, or if you have other concerning symptoms (like severe pain or unusual discharge), it would be wise to consult with your healthcare provider for further evaluation.

In summary, a late period after finishing a Yaz pack can be normal, especially during the first few months of use. Continue taking your pills as directed, and consider taking a pregnancy test if your period does not arrive after the new pack. If you have any further concerns or if your symptoms change, don't hesitate to reach out to your healthcare provider for personalized advice. Remember, it's always better to seek professional guidance when in doubt about your reproductive health.

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