Calculation Algorithm | Source | |
---|---|---|
Ovulation day | 14 days before the 1st day of the next predicted period |
UK’s National Health Service
https://www.nhs.uk/conditions/periods/ UK’s National Health Service https://www.nhs.uk/common-health-questions/pregnancy/can-i-get-pregnant-just-after-my-period-has-finished/ The Family Health Service (FHS) of the Department of Health https://www.fhs.gov.hk/tc_chi/health_info/woman/30076.pdf |
Most fertile days | You're most fertile at the time of ovulation (when an egg is released from your ovaries), which usually occurs 12 to 14 days before your next period starts. | |
Chance of getting pregnant | If you are under 40 and have regular sex without using contraception, there is an 8 in 10 chance you will get pregnant within 1 year. |
UK’s National Health Service
https://www.nhs.uk/pregnancy/trying-for-a-baby/trying-to-get-pregnant/ The Family Health Service (FHS) of the Department of Health https://www.fhs.gov.hk/tc_chi/health_info/woman/30076.html |
Normal menstruation | 21 days – 40 days |
UK’s National Health Service
https://www.nhs.uk/conditions/periods/ The Family Health Service (FHS) of the Department of Health https://www.fhs.gov.hk/tc_chi/health_info/woman/12547.html |