I'm 13, is pregnancy possible?

Before you call me a whore, slut, skank ect. I know that what I did was wrong. I understand that I shouldn't have sex at all at my age. But i have, and there is nothing i can do about it now. Right now my attention is put towards my missed period, my back hurting, my headaches and over tiredness. If I'm pregnant, then i would be a month along. My sister insists I take a home pregnancy test, I just don't know how to weigh my options. I realize I'm too young to raise a child. But the idea of abortion really hurts me. Its like killing a part of me. The guy I was with that night would not be in my childs life. I'm also afraid that my parents would kill me. Pro's and con's please?