It is on a case by case basis but a lot of gas stations do, especially the privately owned ones who also carry medicine and small amounts of grocery.
Of interest, Britney Spears' younger sister, Jamie Lynn, revealed how she found out she was pregnant in a gas station bathroom after she became ill in front of a friend who encouraged her to take a pregnancy test.
"We didn't want to do it at home, so I went in the BP [gas station] and I took a pregnancy test," she recalled and asked her friend to read the results. Know more about the story here.
Pregnancy tests are designed to tell if your urine or blood contains a hormone called human chorionic gonadotropin (hCG). This hormone is made right after a fertilized egg attaches to the wall of a woman's uterus.
This usually happens -- but not always -- about 6 days after fertilization. If you're pregnant, levels of hCG continue to rise rapidly, doubling every 2 to 3 days.
Two main types of pregnancy tests can let you know if you're pregnant: urine tests and blood tests.
Learn more about how pregnancy tests work, when to take one, and how accurate they are at WebMD.com.