Question 1

How accurate is this ovulation calculator?

Accepted Answer

This calculator uses the standard formula: ovulation occurs approximately 14 days before the next period (luteal phase = 14 days). For a 28-day cycle, ovulation falls on day 14. For a 32-day cycle, on day 18. Accuracy depends on cycle regularity — women with irregular cycles (PCOS, perimenopause) will see less reliable predictions. Always consult a gynecologist for fertility planning.

Question 2

What are the 4 phases of the menstrual cycle?

Accepted Answer

Menstrual (days 1-5): uterine lining sheds. Follicular (days 1-13): follicles develop, estrogen rises. Ovulation (around day 14): egg released — peak fertility. Luteal (days 15-28): progesterone rises, body prepares for pregnancy; if no fertilization occurs, progesterone drops and menstruation begins again.

Question 3

What is the fertile window and how long does it last?

Accepted Answer

The fertile window spans approximately 6 days: the 5 days before ovulation plus ovulation day itself. Sperm can survive 3-5 days in the fallopian tubes, and the egg is viable for 12-24 hours after release. Peak fertility is the 2 days before ovulation and the day of ovulation. This is why the fertile window extends before ovulation, not after.

Question 4

Is this calculator a reliable birth control method?

Accepted Answer

No. Cycle-based fertility awareness has a typical use failure rate of 24% per year according to the CDC. Only barrier methods and hormonal contraceptives approved by medical authorities provide reliable pregnancy prevention. Consult a gynecologist to choose the right contraceptive method for you.

Question 5

What is a normal menstrual cycle length?

Accepted Answer

The medical norm is 21-35 days, with 28 days being the textbook average. Period duration is typically 3-7 days. Cycles shorter than 21 days or longer than 35 days may indicate hormonal imbalances such as PCOS, thyroid disorders or perimenopause. A single irregular cycle is usually not concerning; persistent irregularity warrants a gynecologist visit.

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