Sex on the day right after your period ends is a very low-fertility window. In a typical 28 to 30 day cycle, ovulation is roughly 10 to 14 days from the first day of your period, so the day after it ends is nowhere near that window. Pregnancy risk is very low.
Next Steps
You do not need emergency contraception for this exposure. Watch for your next period, and if it does not come within 7 days of the expected date, take a home
pregnancy test with the first morning urine.
Health Tips
For ongoing activity without a condom, please discuss a reliable regular method with a gynaecologist.