Pregnancy Chance Per Day After Period

To get started, simply enter your last period start date and average cycle length into our interactive Pregnancy Chance Calendar to calculate your personalized daily conception probabilities. For more precision, click through to Advanced Options.

How Many Days After Your Period Can You Get Pregnant?

The precise timing of your fertile window depends on your individual cycle. In a textbook 28-day cycle with a five-day period, most people ovulate around Day 14, so fertility begins roughly on Day 9—just four days after bleeding stops. However, everyone’s rhythm is different:

• The average menstrual cycle is about 28 days, but cycles can vary between 21 and 35 days.
• Menstruation typically lasts 3–5 days.
• Ovulation generally occurs 14 days before your next period.
• Sperm can survive up to five days inside the reproductive tract , and the egg remains viable for about 12–24 hours.
• Your fertile window spans the five days before ovulation plus the day of ovulation, a six-day span during which your peak fertility is the two to three days leading up to ovulation.

Because sperm can survive up to five days and the egg for up to 24 hours, the typical fertile window is the five days before ovulation plus the day of ovulation. Within this six-day window, the highest chances are in the two to three days before ovulation.

Understanding Your Menstrual Cycle

Your cycle starts on Day 1, the first day of bleeding, and runs until the day before your next period. While 28 days is the average, understanding the phases helps pinpoint your fertile days:

1. Menstruation (Days 1–5)
   The uterine lining sheds. Average bleeding lasts about 3–5 days.
2. Follicular Phase (Days 1–13)
   Hormones stimulate ovarian follicles to mature in preparation for ovulation.
3. Ovulation (Day 14 in a 28-day cycle)
   A mature egg is released and remains viable for 12–24 hours.
4. Luteal Phase (Days 15–28)
   The uterine lining thickens; if fertilization doesn’t occur, hormone levels fall and menstruation begins anew.

Factors That Can Shift Your Timing

• Cycle irregularities, such as PCOS, may cause unpredictable or absent ovulation.
• Stopping hormonal birth control can delay ovulation for a cycle or two.
• Stress, illness, or major lifestyle changes may push ovulation earlier or later.
• Tracking methods—like basal body temperature charts, cervical mucus observations, and at-home LH surge kits—help you zero in on ovulation and the fertile window.

Tips for Effective Cycle Tracking

1. Log your period start dates consistently in an app or journal.
2. Monitor cervical mucus—clear, egg-white consistency signals approaching ovulation.
3. Use ovulation kits to detect your LH surge 24–36 hours before ovulation.
4. Combine indicators (temperature, mucus, kits) to maximize prediction accuracy.

Bottom line: You can get pregnant any time from the last day of your period up to 24 hours after ovulation, with your highest chance on the day before your egg is released. Start with the interactive calendar above to discover your personalized fertile window!