A condom used correctly, with no leakage or breakage, is highly effective at preventing pregnancy even during your fertile window. Day 16 of a 29-32 day cycle can fall close to ovulation, but an intact condom keeps your risk low.
Next Steps
If your period is more than a week late, take a home urine
pregnancy test for a clear answer.
Health Tips
If you notice any slippage or breakage after the fact, emergency contraception works best within 72 hours.