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Private, Personal Intimate Matters.
The date your period begins= Day 1.
Thumb rule:
One week from Day 1 is SAFE
Last one week before the next period is SAFE
SAFE PERIOD IS
Day 1 to Day 7 [FIRST week]
and
Day 21 to Day 27 [LAST week]RELIABLE AUTHENTIC MEDICAL SEX EDUCATION
The Date your period begins is Day 1.
If your period began on Date15 June then
Day 1= Date 15 June,
Day 7= Date 21 June
SAFE PERIOD IS
Day 1 to Day 7 [FIRST week]= Date 15 June to Date 21 June
and
Day 21 to Day 27 [LAST week]=Date 5 July to Date 11 July
LAST week is one week before the date of expected period. That is Date 5th to 11th July
If your next cycle is expected to begin on 28th day = Date 12 July is 28th Day.
Note: Date 12 July is Day 1 of the next cycle.
Science:
Match DAY -with- calendar Date
The date you expect period – 14 days before this date – one ovum is already released.
or
One ovum is released 14 days before the first day of the next period.