I Need Help, I'll First Tell You My Situation. I

I need help, I'll first tell you my situation.
I just recently started having sex and am not on birth control. I had sex a day or 2 after I finished my period. While having sex the condom broke and he quickly noticed and put a New one on. Then we continued. Now it's a week and 4 days after and I'm feeling a little aick, could I be pregnant, and how early can I take a pregnancy test? I just want to avoid telling my parents or doctor right now, because I am just a teenager, and I'm scared. Will you please help?