Pregnant but didnt get a good answer yest. my brothers baby?

ok so im 16 and my brother is 15 a few months back i walked in on him jerking off,and asked him if i could try(to practice for my bf) after he said he wanted to do it back, it was kinda weird but i thouh it was only fair, so he fingered me. one thing led to another and he got on topf me, and was about to go in but i pushed him off, cuz im not an inbred....so i thought. but before i pushed him off he came on me. well 2 months later i still hadnt got my period so i bought a test, and it was positive. it has been 6 months since this incident and its gettin hard to hide. my friends been taking me to the dr. and he said im due on june 29, which will be here b4 i know it. so im asking what should i do. i havent told anybody exceot myfriend, not even mybrother. or should i get an abortion which i am way against.?? its kicking up a storm lately so i would feel bad if i did tht. what do i tell my parents? i was honestly thinkin of goin on maury becuz they wudnt get mad on tv. but tht would embarr them, help, n this is real, and no my bro dont know, and its not my fault he came!