Track your fertile window and find your best days to conceive
Average is 28 days. Track your cycle for 2-3 months for accuracy.
Ovulation is when your ovary releases an egg. This typically happens about 14 days before your next period starts. The egg survives for 12-24 hours after release.
Your fertile window includes the 5 days before ovulation plus ovulation day. Sperm can survive in your body for up to 5 days, so intercourse during this window can result in pregnancy.
The 2 days before ovulation and ovulation day itself offer the highest chance of conception - up to 30% per cycle. These are your most fertile days.
If fertilization occurs, the embryo typically implants 6-12 days after ovulation. Some women experience light spotting during implantation.
✓ Track Your Cycle
Monitor your cycle for 2-3 months to understand your pattern. Cycle lengths can vary!
✓ Have Regular Intercourse
Aim for every 2-3 days during your fertile window, especially the 2 days before ovulation.
✓ Watch for Signs
Cervical mucus becomes clear and stretchy (like egg whites) during fertile days. Some women feel mild cramping during ovulation.
✓ Maintain a Healthy Lifestyle
Balanced diet, regular exercise, healthy weight, and managing stress can all improve fertility.
✓ Consider Ovulation Tests
Home ovulation predictor kits (OPKs) can confirm ovulation by detecting the LH surge 24-36 hours before.
✓ Be Patient
For healthy couples under 35, it can take up to 12 months to conceive. This is completely normal!
This calculator provides estimates only. Every woman's cycle is unique. For the most accurate results, track your cycle over several months and consider using ovulation predictor kits.
Not for contraception: This tool is designed to help couples trying to conceive. It should NOT be used as a method of birth control.
When to see a doctor: If you're under 35 and haven't conceived after 12 months of trying, or over 35 and haven't conceived after 6 months, consult a fertility specialist.
Irregular cycles: If your cycles vary by more than 7-9 days, this calculator may be less accurate. Speak with your healthcare provider about tracking methods that work better for irregular cycles.
This calculator assumes a regular cycle with ovulation occurring 14 days before your next period. It's about 80% accurate for women with regular cycles. For best accuracy, track your cycle for 2-3 months and use ovulation tests.
While the chances are much lower, it's theoretically possible if you ovulate earlier or later than expected, or if sperm survives longer than usual. Always use protection if you're not trying to conceive.
Use your average cycle length, but be aware predictions may be less accurate. Consider tracking basal body temperature or using ovulation predictor kits for better accuracy with irregular cycles.
For most accurate results, wait until at least 14 days after ovulation (typically the day your period is due). Testing earlier may give a false negative even if you are pregnant.
Common signs include: clear, stretchy cervical mucus (like egg whites), mild cramping on one side (mittelschmerz), breast tenderness, increased sex drive, light spotting, and slight increase in basal body temperature.
For couples under 35 with no fertility issues, there's about a 20-30% chance per cycle. 80% of couples conceive within 6 months, and 90% within 12 months of regular, unprotected intercourse during fertile windows.