Is there any specific pregnancy test recommended to take? how much would it cost to buy one?

About $14 for 3tests: Any urine pregnancy test from the drugstore. A test done correctly will give a reliable result 3 weeks after sex (or when conception might have happened) or 1 week after missing a period. If done sooner, a positive result is likely real, but a negative result may be due to testing too soon, and therefore lead to a repeat test. If a woman has her normal regular periods, then she is not pregnant.