Yes, it is possible to get pregnant a day before your period starts, though the likelihood is relatively low. Pregnancy can occur whenever sperm meets a viable egg, and timing matters. Most pregnancies result from intercourse during the five days before ovulation through the day of ovulation itself. However, cycle length and ovulation timing vary significantly between individuals and even between cycles in the same person. In a typical 28-day cycle, ovulation occurs around day 14, placing the fertile window roughly in the middle of the cycle. A day before your period would be near the end of the cycle, when fertility is generally lowest but not impossible. Sperm can survive up to five days in the reproductive tract, which creates complexity in predicting the exact fertile window. Additionally, some people have irregular cycles or earlier-than-expected ovulation, which can shift the timing of fertility. The further from ovulation intercourse occurs, the lower the pregnancy risk, but there's no time in the cycle that's completely risk-free if pregnancy prevention is a goal. If you're concerned about contraception, using consistent birth control methods is more reliable than timing alone. If you're trying to conceive, tracking ovulation through methods like basal body temperature, cervical mucus changes, or ovulation tests can help identify your most fertile days more accurately.