The pregnancy test establishes if there is a certain hormone in blood or urine-hcg or the pregnancy hormone. As far as I know, home pregnancy tests (hpt) vary regarding the period of time necessary to pass before taking it.
"urine tests can determine pregnancy about 2 weeks after ovulation. Some more sensitive urine tests can tell if you are pregnant as early as 6 days after you conceive, or one day after you miss a menstrual period."
i am sorry, but I can't tell you a certain product...I'm not from around... :)so you should ask the pharmacist which hpt is best for you...They know what products they have. Have confidence. They should also be able to recommend something taking into account how much money you want to spend. I usually trust products that are more expensive, but I can tell you that medicine is very carefully tested and there is no room for mistakes...So I would trust even the cheapest hpt.
Good luck...And maybe you'll let us know how it turned out... :d