At mine they are free.
Definitely invest in some condoms. Not only will they protect you from pregnancy, but they will also protect you from STDs. Even if you think you are safe from them, you never know until you and your partner are both tested. Even if your partner only had sex with ONE other person besides yourself who he claims was safe, you never know. That one other could have had sex with 3 others, one of which who has an STD and would pass it on. It really is something extremely serious that you have to consider when having sex. You may think it won't happen to you, but it can. Please, please always wear a condom. It will protect you and your partner from both STDs and from unwanted pregnancies.
If this ever happens again in the future, you can go with a friend who is 18 years old to the pharmacy, or you can be under 18 and go to planned parenthood to by Plan B. If taken within 3 days of having sex, it can help to prevent pregnancy and greatly decrease your chances of becoming pregnant.
Good luck; take a test in 2 weeks and keep us updated.