How to calculate the safe period

Patient's question:

Detailed medical condition and consultation purpose: My question is, I have taken birth control pills which disrupted my menstrual cycle, and I also touched cold water during my period, which caused it to be delayed by about 10 days. If this is the case, how should the safe period be calculated? Is it calculated from the day it's clean? Please give me an accurate and detailed answer. Thank you.
First follow-up question: If the menstrual cycle is irregular, you can take the 14th day before the next period as the ovulation period for calculation.
According to this, can't I calculate this time? But after it's clean, if I haven't used contraception for 3 consecutive days, is there any danger?
Can you tell me,

Doctor's answer:

Hello! The ovulation date of a woman is generally about 14 days before the next menstrual period. After the egg is released from the ovary, it can survive for 1 to 2 days in the fallopian tube, waiting for fertilization; male sperm can maintain its vitality in a woman's reproductive tract for 2 to 3 days, so sexual intercourse during the days before and after ovulation increases the likelihood of conception. For safety, we refer to the 5 days before the ovulation date, the 4 days after, and the ovulation date itself as a total of 10 days, known as the ovulation period. Because sexual intercourse during the ovulation period increases the likelihood of conception, this period is also called the fertile window or the risky period.

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