Ovulation Day for a 39-day Cycle When the Last Period Started on December 18, 2025

⚪ Ovulation day (highest chance for pregnant) is:

2026-01-12 (Monday)

📅 Fertile window: Jan 08 - Jan 13

Thu Fri Sat Sun Mon Tue
Jan 08 Jan 09 Jan 10 Jan 11 Jan 12 Jan 13
👦 👦 👦/👧 👧 👧 👧

Pregnacy test day: Jan 27 2026
💡 According to recent studies, the chance of conception during ovulation is about 25%. Therefore, do not worry when the test comes out negative. Another chance is just a month of waiting.

If pregnant:
🤱 Due date: Sep 24 2026 (Thursday)

If not pregnant.
🩸 Next period: Jan 26 2026
⚪ Next ovulation: Feb 20 2026

Nearest days of ovulation for a 39-day cycle

The closest calculation of the day of ovulation for different cycle lengths when the first day of the period was December 18, 2025