The scenario:
A 28-year-old patient (she/her) comes in for her annual visit. She has been using a combined oral contraceptive for the past three years. She recently stopped taking the pill and switched to using a period-tracking app after hearing online about the long-term effects of hormonal birth control on her fertility. She has one sexual partner, it feels very important to her not to get pregnant for at least another 1–2 years, and has regular cycles.
How do you respond to her concerns about hormonal birth control?
Start by taking the concern seriously, not redirecting away from it. Patients who feel dismissed are less likely to engage honestly, and this patient is already making decisions based on information she’s gathered on her own. This is also a natural moment to ask what she’s been reading or watching, which can open a more productive conversation.
Her specific concern here is impact on future fertility. This is one of the most common, and most persistent, pieces of misinformation circulating online about hormonal birth control. What you’re not doing here is talking her back into the pill. Her preference to avoid hormones is personal, and the clinical task is to make sure her next choice is an informed one.
The evidence is clear: combined oral contraceptives are very effective at preventing pregnancy when you use them but do not impact underlying fertility. For most patients, ovulation resumes almost immediately after stopping the pill and people can get pregnant right away. There may be a brief delay, particularly for patients with underlying cycle irregularities, but the hormonal contraception itself does not damage reproductive function.
Acknowledging the kernel of truth, that it can take a cycle or two for periods to normalize after stopping the pill, and that underlying conditions like PCOS may become more apparent, while correcting the overstatement is more effective than a flat denial. Additionally, there are hormonal contraceptive methods, specifically the shot, where a return to baseline fertility may be delayed for a few months or up to a year for some people after stopping.
What does this patient need to know to make an informed decision about using a fertility awareness-based method (FABM)?
Before getting into specifics, it’s worth naming where FABMs actually land on the effectiveness spectrum because the category contains methods that perform very differently. Since it is very important to this patient to prevent pregnancy, she deserves accurate information about what makes these methods work well and where the potential limitations lie:
Effectiveness varies by method — significantly. Not all FABMs perform the same. Well-taught, consistently practiced methods (symptothermal, app-based with temperature data) have typical-use effectiveness comparable to the pill. Calendar or rhythm methods perform considerably worse. The broad category of FABM is not monolithic, and the difference in effectiveness matters.
Consistent practice is essential. FABMs work best when used consistently and intentionally. As a rule, FABM work by identifying fertile days accurately and either abstaining or using barrier backup on those days. The key question for this patient is whether she can identify her fertile days and if she and her partner are willing to do that, every cycle.
Pregnancy risk tolerance matters. A patient who would be significantly distressed by a pregnancy warrants an honest conversation about method efficacy and comfort with the day-to-day demands of FABM. This is not a value judgment. It’s part of informed consent.
There’s a learning curve. Especially with app-based methods, the first few cycles carry higher uncertainty while the algorithm or the patient calibrates. Additional backup with a barrier method while learning to identify fertile days is worth discussing.
Data privacy. Not all apps in the App Store track and store your data in the same way. Patients should be advised that some period tracking apps may be selling your data. If patients want to use a calendar based FABM or just track their period, Euki is a free period tracker, developed by a non-profit that does not track or store your data, and is available in English and Spanish.
How can I supportively explain the difference between tracking a cycle with an app and using FABM effectively?
Many patients are already using a period-tracking app and may believe that’s equivalent to using a FABM. It isn’t, and how you explain that distinction shapes whether she walks away with an accurate picture of what she’s relying on for pregnancy prevention.
A useful framing:
Period-tracking apps predict your cycle based on your history. FABMs detect what your body is actually doing right now.
Most period-tracking apps use calendar math. They average past cycle lengths to estimate when your next period and ovulation will occur. This works reasonably well for planning purposes, but it doesn’t account for cycle-to-cycle variability and provides no real-time physiological signal to help people understand their risk of pregnancy today. Using a calendar-based tracker as birth control is essentially a digital version of a standard days method, a.k.a., the rhythm method, which has a typical-use failure rate of about 12-25% per year.
In contrast, FABMs increase the effectiveness of preventing pregnancy by relying on a combination of measurable physiological markers:
- Basal body temperature (BBT): A sustained rise of approximately 0.2°C (0.4°F) confirms that ovulation has occurred. BBT tracking alone is retrospective since it confirms ovulation after the fact, but when combined with other markers, it becomes a more useful signal.
- Cervical mucus monitoring: Changes in cervical secretions across the cycle signal approaching and confirmed ovulation. Methods like Billings and Creighton are built around this marker and require formal instruction to use reliably.
- Symptothermal method: Combines BBT and cervical mucus monitoring. This is the most well-studied traditional FABM and, with proper instruction, among the most effective.
- Hormonal urine testing (LH/estrogen): Some app-based methods incorporate urine ovulation testing to detect the LH surge, which immediately precedes ovulation, providing a prospective signal that BBT alone cannot.
FABM effectiveness depends on what data a patient collects and how consistently a patient acts on it. A calendar-only tracker, however well-designed, is not as reliable as a FABM.
What technology-based options are available to support FABM use?
For patients interested in a structured, app-based approach, there are a few options worth knowing about.
- Natural Cycles (149.99/year without insurance): The only FDA-cleared birth control app in the United States. It uses a basal body temperature-based algorithm, with optional urine LH testing, to assign daily fertility status. Most commercial insurance plans are required to cover it at no cost under the ACA with a prescription. Government health plans including Medicaid do not currently cover it. Prescribing and insurance details for providers here.
- Clue (free basic; Plus ~$99.99/year): Supports the symptothermal method and allows tracking of BBT, cervical mucus, and other cycle markers. It is not FDA-cleared as a contraceptive device. Its EU-based privacy protections are notably strong. The free version includes enough functionality for FABM charting.
- Kindara (free basic; premium upgrades available): Allows tracking of BBT, cervical mucus, cervical position, and LH test results, and supports chart sharing with a provider or partner. It uses patient-specific data rather than population averages for cycle predictions and has been evaluated favorably in peer-reviewed research comparing apps for contraceptive FABM use. Not FDA-cleared as a contraceptive device.
Key Points
- Combined oral contraceptives do not cause long-term impairment of fertility. Ovulation typically resumes within weeks of stopping.
- FABMs are evidence-based and a legitimate contraceptive choice. Effectiveness depends on the specific method and consistent use. Calendar-only apps are less effective at predicting fertile days.
- Most period-tracking apps use calendar math, not physiological data to predict fertile days. A patient using one as birth control may not understand that distinction, and a clinical visit can be a critical opportunity to clarify it.
- Natural Cycles is the only FDA-cleared contraceptive app. Most commercial insurance plans cover it under the ACA with a prescription sent to Alto Pharmacy (NDC 50014-063028). Government health plans currently do not.
- Patient fit matters. Assess pregnancy-risk tolerance, willingness to use another method or abstain on fertile days, and motivation to track consistently as part of FABM counseling.