Most probable conception window
Nov 15 - Nov 21
Centered on cycle day 14.
Family Planning
Conception Calculator
Mirror the calculator.net experience but upgrade it with richer data: most probable conception days, fertility calendars, six-cycle projections, and exportable reports tailored to your exact cycle length.
Enter data, hit Calculate, then review the personalized map.
Ovulation + pregnancy test
Nov 20, 2025
Earliest home pregnancy test: Dec 4
Estimated due date
Aug 13, 2026
Based on Naegele's rule (40 weeks).
Key dates for this cycle
More detail than calculator.net—capture the three-day peak, window span, pregnancy-test timing, and projected due date.
| Most probable days | Nov 19 - Nov 21 |
| Fertile window | Nov 15 - Nov 21 |
| Pregnancy test day | Dec 4, 2025 |
| Estimated due date | Aug 13, 2026 |
Daily probabilities
5 day(s) before
Begin trying every other day.
4 day(s) before
Keep intercourse consistent.
3 day(s) before
Peak sperm availability.
2 day(s) before
Highest fertile window—aim for intimacy today.
1 day(s) before
Maintain frequency; ovulation is imminent.
Ovulation day
Ovulation day—try within 12 hours.
1 day(s) after
Cycle likely closed; monitor for early pregnancy.
Calendar preview
November 2025
Week WSMTWTFS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
PeriodFertileOvulation
December 2025
Week WSMTWTFS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
PeriodFertileOvulation
January 2026
Week WSMTWTFS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
PeriodFertileOvulation
Important dates for the next 6 cycles
Table mirrors calculator.net's data but extends it with pregnancy-test reminders and due dates for each projected cycle.
| Cycle # | Period start | Conception window | Pregnancy test | Estimated due date |
|---|---|---|---|---|
| 1 | Nov 6, 2025 | Nov 15 - Nov 21 | Dec 4 | Aug 13, 2026 |
| 2 | Dec 4, 2025 | Dec 13 - Dec 19 | Jan 1 | Sep 10, 2026 |
| 3 | Jan 1, 2026 | Jan 10 - Jan 16 | Jan 29 | Oct 8, 2026 |
| 4 | Jan 29, 2026 | Feb 7 - Feb 13 | Feb 26 | Nov 5, 2026 |
| 5 | Feb 26, 2026 | Mar 7 - Mar 13 | Mar 26 | Dec 3, 2026 |
| 6 | Mar 26, 2026 | Apr 4 - Apr 10 | Apr 23 | Dec 31, 2026 |
How to use this planner
Fertility is highest during the six-day window ending on ovulation day. Sperm can survive for five days, so intercourse before the egg is released typically outperforms trying after. Layer in cervical-mucus tracking, basal body temperature, and LH surge testing to tighten predictions.
If cycles swing by more than seven days, or if you do not see a period for 90 days, share these logs with a clinician. This tool mirrors calculator.net but adds richer insights, more context, and professional-ready exports so you're always a step ahead.