My twin sister is realy sick. how do i not get sick?

we are 14 year old twin identical sisters. my twin sister aubrey has laryngitis, bronchitis, and a stomach virus. we share a room, and really well share everything but beds, she has a top bunk i have a bottom. she is contagious but i have no option but to sleep in our room. im coughing really hard and i have a stomachache but i dont think im sick. i also have a 100 degree fever and i threw up twice, but i dont think im sick. how do i not get sick?