(3) Where, in an appeal under this Act, a penalty assessed by the Minister under this section or section 163.2 is in issue, the burden of establishing the facts justifying the assessment of the penalty is on the Minister.
The number of days in your cycle is calculated by counting the number of days from the beginning of one period to the beginning of the next period. If you have a short cycle, for example 21 days, and you bleed for 7 days, then you could ovulate right after your period.
This means that, if you have a 28-day cycle, you will ovulate around Day 14. However, few women ovulate like clockwork. As a result, ovulation can occur anywhere from Day 8 to Day 20 depending on the length of your cycle.