(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.
If you want to know how you can prevent a possible late period, then. During the time you ovulate, which is usually about 10-18 days after the first day of your period (depending on your cycle), try to eliminate any work-related or relationship stress.