Harpgirl, I don't think that anyone can tell you what to do in a given situation. You have to decide then and there. As the song says,

...ain't nobody else can walk it for you,
You gotta walk it by yourself.

May I suggest, however, that a gun AND a knife would be, ahem, overkill? In fact, I think that a meter-long piece of wooden closet rod might be preferable if you DO want a weapon.

For close combat, my preferred weapon is a hardwood nightstick.