You can get pregnant as early as 5 days after your period ends. This is because sperm can live inside you for up to 5 days, and ovulation (the release of an egg) typically occurs around day 14 of a 28-day cycle. If you have a shorter menstrual cycle, ovulation can happen earlier, which means your fertile window—and the chance to conceive—may overlap with the days just after your period. Key points:

• Ovulation usually happens about 14 days before your next period.
• The fertile window is the 6 days around ovulation (approximately 5 days before and 1 day after ovulation).
• You can get pregnant on any day during this fertile window.
• If your period lasts 2 to 7 days, then having unprotected sex as soon as 5 days after the period can lead to pregnancy.
• Women with shorter or irregular cycles are more likely to conceive right after their period.
• Sperm can survive up to 5 days inside the reproductive tract, so intercourse near the end or just after the period can result in pregnancy if ovulation occurs soon after.

So, pregnancy is possible anytime from the end of your period onward, depending on your individual cycle and timing of ovulation.