How many days before your period should you go for a pregnancy test my periods are due on fourth so when should go for test?

There are no days before your period, when you already are pregnant. As soon as you are pregnant your next due period at the 4th will not come. When you are without periods for 2 months, it is very likely that you are pregnant.

Many women don't know, that after 10 days after their last period, they are in a period of another 10 days that hey can become pregnant.

Mostly it is only 7 days. So that means that 21 days between your period you cannot become pregnant.

Short: Period + 10 days free. + 8 days pregnancy possible. + 10 days free.

Dr. Phylopi