Can you get pregnant on your period?
Last updated September 3, 2026.
Unlikely but possible: sperm survive up to 5 days, and ovulation can come early in short or irregular cycles - sex late in a long period can overlap the fertile window. Add the confuser: ovulation spotting and irregular bleeding get mistaken for periods. The honest odds: lowest of the cycle, not zero - and "lowest" is not a contraceptive strategy. If pregnancy is not the plan: contraception regardless of cycle day, and emergency contraception exists for the just-happened case - sooner is better.
What to do
- Never count the period as protection. Short cycles make the overlap real.
- Know the sperm math. Up to 5 days of survival changes the calendar.
- Use emergency contraception promptly if needed. The window is days, not weeks.
- Track if trying. The fertile window is the 5 days before ovulation plus the day itself.
Related questions
- Can you get pregnant right after your period?
- What is the fertile window?
- Can you get pregnant on birth control?
- What is spotting between periods?