Pregnancy With The Nexplanon

The Nexplanon implant is widely recognized as one of the most effective forms of birth control available today. As a small, flexible rod inserted under the skin of the upper arm, it releases a low, steady dose of progestin to prevent ovulation. Because of its high success rate—typically cited as over 99% effective—the idea of pregnancy with the Nexplanon seems almost paradoxical to many users. However, while extremely rare, it is a possibility that raises many questions regarding efficacy, symptoms, and what to do if you suspect you might be expecting while the implant is still in place.

Table of Contents

Understanding Nexplanon Efficacy and How It Works

To understand why pregnancy is so rare, it is helpful to understand the mechanism behind Nexplanon. The implant works through two primary actions: it inhibits ovulation (the release of an egg) and thickens cervical mucus to prevent sperm from reaching an egg. Because it is not reliant on daily user compliance—unlike the birth control pill—it eliminates the risk of human error, which is the leading cause of contraceptive failure.

When someone discovers they are pregnant while using the device, it is often due to one of three factors:

Recognizing the Signs: Is it Pregnancy or Side Effects?

One of the most confusing aspects of pregnancy with the Nexplanon is that the common side effects of the implant often mimic early pregnancy symptoms. Many people experience spotting, irregular bleeding, breast tenderness, or mood changes as their body adjusts to the hormonal input. Consequently, it can be difficult to distinguish between the body reacting to the implant and the body responding to a pregnancy.

Here is a comparison table to help you distinguish between typical side effects and potential red flags:

Symptom	Nexplanon Side Effect	Potential Pregnancy Indicator
Spotting/Bleeding	Very common, especially in the first 3–6 months.	Usually stops during pregnancy; unusual spotting should be investigated.
Breast Tenderness	Common during the adjustment period.	Often more intense and accompanied by physical changes in the breast.
Nausea	Rare, usually mild.	Common morning sickness, often triggered by specific smells or foods.
Fatigue	Occasional.	Significant, overwhelming tiredness.

What to Do If You Suspect You Are Pregnant

If you have any reason to believe you are pregnant, the very first step is to take an over-the-counter home pregnancy test. While the hormones from the Nexplanon do not interfere with the accuracy of these tests—as they detect the hormone hCG—a positive result requires immediate medical attention. Do not panic, but do act promptly.

If the test is positive, follow these steps:

Schedule a Doctor's Appointment: Contact your gynecologist or primary care physician immediately to confirm the pregnancy via a blood test.
Confirm Implant Location: Your doctor will need to verify the position of the implant in your arm.
Discuss Removal: If a pregnancy is confirmed, the doctor will likely recommend the removal of the Nexplanon implant. Although there is no evidence that the progestin in Nexplanon causes birth defects, it is standard medical practice to remove the source of the hormone once a pregnancy is established.
Screen for Ectopic Pregnancy: Because the implant is highly effective at preventing uterine pregnancies, if a pregnancy does occur, there is a statistically higher likelihood that it may be ectopic (outside the uterus). This is a medical emergency that requires prompt diagnosis.

💡 Note: Do not attempt to remove the implant yourself or have it removed by anyone other than a trained medical professional, as the procedure requires specialized techniques to ensure the device is extracted safely.

The Reality of Risks and Medical Oversight

The primary concern regarding an ongoing pregnancy while the device is in situ is the risk of an ectopic pregnancy. If you experience sharp, one-sided abdominal pain, dizziness, or shoulder pain, seek emergency medical care immediately. These are potential warning signs of an ectopic pregnancy, which is a life-threatening condition that can occur even with highly effective contraceptives.

Outside of the ectopic risk, the medical community maintains that the small amount of progestin released by the implant is not associated with adverse outcomes for a developing fetus. However, every pregnancy is unique, and ongoing consultation with an OB-GYN is essential to monitor the development and ensure your personal health is the priority.

Maintaining Peace of Mind

While the prospect of an unintended pregnancy while on birth control can be stressful, it is important to keep the statistics in perspective. Nexplanon remains a gold-standard contraceptive precisely because its failure rate is so remarkably low. If you find yourself experiencing symptoms that worry you, taking a simple test and consulting with your doctor is the fastest way to get clarity and peace of mind.

If you are experiencing irregular bleeding or side effects that make you feel anxious about the possibility of pregnancy, consider keeping a symptom log. Documenting when you have bleeding, how long it lasts, and any other physical symptoms can provide your doctor with valuable information during your wellness visits. Knowing your body and staying informed about how hormonal contraception interacts with your system is the best way to feel confident and secure in your reproductive health choices.