HELP!!!

Is it possible to get pregnant when you're on your period? Me and my boyfriend had unprotective sex on the 9th of this month, and I was on my period. I ended my period on the 11th, and of course after we had sex I was uneasy about the feeling and started doing some research on like yahoo answers and Sex Ed websites. They all had very different answer outcomes. 
Of course a positive pregnancy is a scary answer about all this. But I'm a firm believer that if I was old enough to make the "grown" decision to have sex that if I am pregnant I'll have to take the responsibility for a child. I'm 16 turning 17 this year. 
I'm supposed to be going to a clinic on March 1st to get checked out and possibly put on birth control but I don't want to be put on it if I don't know if I'm pregnant or not. Could a home pregnancy test tell if I'm pregnant if it's only been 2 weeks since? I've been very worried and moody and having pains in my side lately and I know it's possibly too early for symptoms. I have so many questions with no answers. Please help!