Let us take an example.
If suppose any one is having regular period and a regular 28 days cycle.
And suppose period starts on 1st day of the month.
Then in that case day 1-4 - periods.
Arround day 14 - ovulation.
Day 28 - cycle ends.
For not getting pregnant
or you can say the safe period. Its. Avoid 7 days +/- from day 14.
That means avoid from 7th to 21.
That means from day 1 to day 7 and from day 2 to day 28 its safe.
And unsafe from day 7 to day 21...
NOTHING IS 100% SAFE...
Pregnancy can occur. Because this is the ideal condition which we have discussed. So you should consult your doctor and get help so that particular dates can be decided according to different individuals. Hope this will help many people having some kind of help from this discussion. Thanks.