There are pregnancy test kits you can get in drug stores. Unless you have had exposure to semen into your vagina then I would highly doubt you got pregnant. There are clinics that you can go to as well to get examined as well as getting information on safe sex and birth control.
If I’m late for a week I will probably go take a test. I am 21 years old and I’m a Virgin which probably contributes to the lack of knowledge about this.