It hasn't personally happened to me, but I know what the nurse said is definately true! I've heard of that happenening, that both will implant but one will vanish. Have faith sweetie, I know it's hard to be optimistic, but you ARE pregnant! Let's just be hopeful that everything is ok, and that fact that you have no side affects of a m/c are awesome! It'll be a long weekend for you full of worry, but lets just pray that Monday brings you great news!