When Is A Good Time To Get Pregnant?

Actually the 14th day (after your period ends) is the most probable day for the release of the ovum (egg). It can remain alive for up to 48hrs, so these days are important regarding pregnancy and they are the days when you are most likely to be fertile.
However, some women may have an irregular cycle, so it may be slightly before or after the 14th day.
You can buy a kit which will indicate when you are ovulating and hence more fertile.

I thought it was 14 days from the first day of your period?

I'm asking that which time female  100% pregnant  after intercourse

To get pregnant and maximize your chances you need to be having intercourse every two to three days on a regular basis if you are doing this then it is also best to try not to stress about it too it will happen