Please help me I think I'm pregnant ?

Ok so me ad my bf first had sex 16 days ago and for the last week I have been feeling sick to my stomach. I haven't thrown up but I have been holding it back and it just keeps getting worse and worse. I also and to pee all the time literally ever 10 min. I am on birth control but I don't take it vary responsibly. Please someone help me I don't know I I should get a pregnancy test quit yet but I just need some advice.