Why would you decide to have a child at age 14? If you're having sex and you're not using ANY form of birth control (condoms or anything) then you are pretty much actively trying to get pregnant. It doesn't make sense for someone who's 14.
I think you should start using condoms with spermicides until you know whether or not you're pregnant. If you are not pregnant then schedule an appointment with a doctor so you can decide on a more reliable form of birth control.
You need to wait at least two weeks after sex to test, so you'll have to go from your last time having unprotected sex.