How long do two ovulation test strips need to last?

Patient's question:

No

Doctor's answer:

Hello, the ovulation date is generally around 14 days before the next menstrual period. Starting from the first day of the next menstrual period, subtracting 14 days or counting backwards 14 days gives the ovulation day. The ovulation day, plus the 5 days before it and the 4 days after it, is called the fertile window. The 4 days before the ovulation day and the 5 days after it are the risky period (ovulation period), when pregnancy is more likely.