Had sex on saturday,took postinor2.took another dose on sunday without sex.had sex again on monday and took another dose.possibility of pregnancy?

Small chance: The likelihood of you being pregnant is low, but not zero. You should get a pregnancy test in the next two weeks to be sure. This is not a good strategy for contraception. I would recommend that you see your doctor and start on a daily contraceptive pill. Additionally, use a condom to avoid sexually transmitted disease such as HIV, which is common in your country