Did you have your period? You can take a pregnancy test as soon as you miss your period. If you had your period, it is unlikely you are pregnant.
Never lie about birth control and always make your partner wear a condom. Condoms are cheaper than the alternative and they 'save' you in so many ways. For instance, there are diseases you can get that you would never know he had - such as aids, herpes, warts, hpv, etc. These are
life long diseases that there are no cures for. A condom can help keep you safe from these. Not to mention the pregnancy aspect.
Go to your local family planning clinic and get educated on birth control and sex.