Missed a birth control pill? Enter pill type, how late, where you are in the pack, and whether you had sex to estimate your per-act pregnancy risk. No data stored.
▶How accurate is this calculator?
It combines age-specific baseline fecundability with adjustments for pill type, hours late, missed pills, pack week, and any emergency contraception. It provides an estimate only. Individual biology and timing can change outcomes.
Educational use only. Not medical advice.
▶What if I missed a combined pill by less than 24 hours?
Short delays usually leave some protection in place, but risk depends on where you are in the pack and whether you also missed pills. Enter your scenario for a tailored estimate and consider checking the patient information for your brand or speaking with a pharmacist.
▶Are progestin-only pills (POP) more sensitive to late doses?
Yes, POPs have a narrower on-time window, so being several hours late can increase risk more than with combined pills. The calculator applies a larger adjustment when POP doses are late.
▶Does emergency contraception change the result?
It can. Levonorgestrel and ulipristal reduce risk most when taken promptly, and a copper IUD is the most effective. Select what you used and when to see the adjusted estimate.
▶When is the first accurate day to test?
If you enter a sex date, the tool will show an estimated first accurate test day based on typical hormone rise timing.
▶Will you store or share my data?
No. This on-site calculator runs in your browser only. We do not store entries or results.