You won't know you are pregnant much before a month. As soon as you know you are pregnant you can have an abortion.
You can know the pregnancy status before the due date of periods. It is expensive. There is no advantage to know it before ten days of missed periods.
You will be able to know after 2 weeks.
Soon as you feel your body changing
About 9 days after conception if you know when you concieved. Otherwise about 6 days before your anticipated period. Levels of HCG will be present and a blood test will be able to tell you if you're pregnant or not.
About 6 days.
as soon as you know
2 weeks after sex at the earliest
As soon as you know your pregnant.